diff --git a/CABook/CABook.xcodeproj/project.pbxproj b/CABook/CABook.xcodeproj/project.pbxproj
index 7572066..61936e0 100644
--- a/CABook/CABook.xcodeproj/project.pbxproj
+++ b/CABook/CABook.xcodeproj/project.pbxproj
@@ -7,6 +7,14 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		594B738C1974F2CE004C2735 /* InfoViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 594B738A1974F2CE004C2735 /* InfoViewController.swift */; };
+		594B738D1974F2CE004C2735 /* InfoViewController.xib in Resources */ = {isa = PBXBuildFile; fileRef = 594B738B1974F2CE004C2735 /* InfoViewController.xib */; };
+		594B73901974F99E004C2735 /* FlatteningViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 594B738E1974F99E004C2735 /* FlatteningViewController.swift */; };
+		594B73911974F99E004C2735 /* FlatteningViewController.xib in Resources */ = {isa = PBXBuildFile; fileRef = 594B738F1974F99E004C2735 /* FlatteningViewController.xib */; };
+		5986AA5A19725020000F0835 /* GroupOpacityViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5986AA5819725020000F0835 /* GroupOpacityViewController.swift */; };
+		5986AA5B19725020000F0835 /* GroupOpacityViewController.xib in Resources */ = {isa = PBXBuildFile; fileRef = 5986AA5919725020000F0835 /* GroupOpacityViewController.xib */; };
+		5986AA5F1972ACA9000F0835 /* PerspectiveViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5986AA5E1972ACA9000F0835 /* PerspectiveViewController.swift */; };
+		5986AA631972AE7A000F0835 /* PerspectiveViewController.xib in Resources */ = {isa = PBXBuildFile; fileRef = 5986AA621972AE7A000F0835 /* PerspectiveViewController.xib */; };
 		59C354D7196E0A89003BEFED /* MasksViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 59C354D5196E0A89003BEFED /* MasksViewController.swift */; };
 		59C354D8196E0A89003BEFED /* MasksViewController.xib in Resources */ = {isa = PBXBuildFile; fileRef = 59C354D6196E0A89003BEFED /* MasksViewController.xib */; };
 		59C49125196818A8002F75E9 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 59C49124196818A8002F75E9 /* AppDelegate.swift */; };
@@ -15,6 +23,10 @@
 		59C4914019681A59002F75E9 /* ClockViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 59C4913E19681A59002F75E9 /* ClockViewController.swift */; };
 		59C4914119681A59002F75E9 /* ClockViewController.xib in Resources */ = {isa = PBXBuildFile; fileRef = 59C4913F19681A59002F75E9 /* ClockViewController.xib */; };
 		59C491431968E878002F75E9 /* ListViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 59C491421968E878002F75E9 /* ListViewController.swift */; };
+		59FED01E19736E5A005B056E /* SublayerTransformViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 59FED01C19736E5A005B056E /* SublayerTransformViewController.swift */; };
+		59FED01F19736E5A005B056E /* SublayerTransformViewController.xib in Resources */ = {isa = PBXBuildFile; fileRef = 59FED01D19736E5A005B056E /* SublayerTransformViewController.xib */; };
+		59FED022197371F7005B056E /* BackviewViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 59FED020197371F7005B056E /* BackviewViewController.swift */; };
+		59FED023197371F7005B056E /* BackviewViewController.xib in Resources */ = {isa = PBXBuildFile; fileRef = 59FED021197371F7005B056E /* BackviewViewController.xib */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -28,6 +40,14 @@
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXFileReference section */
+		594B738A1974F2CE004C2735 /* InfoViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = InfoViewController.swift; sourceTree = "<group>"; };
+		594B738B1974F2CE004C2735 /* InfoViewController.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = InfoViewController.xib; sourceTree = "<group>"; };
+		594B738E1974F99E004C2735 /* FlatteningViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FlatteningViewController.swift; sourceTree = "<group>"; };
+		594B738F1974F99E004C2735 /* FlatteningViewController.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = FlatteningViewController.xib; sourceTree = "<group>"; };
+		5986AA5819725020000F0835 /* GroupOpacityViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = GroupOpacityViewController.swift; sourceTree = "<group>"; };
+		5986AA5919725020000F0835 /* GroupOpacityViewController.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = GroupOpacityViewController.xib; sourceTree = "<group>"; };
+		5986AA5E1972ACA9000F0835 /* PerspectiveViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = PerspectiveViewController.swift; sourceTree = "<group>"; };
+		5986AA621972AE7A000F0835 /* PerspectiveViewController.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = PerspectiveViewController.xib; sourceTree = "<group>"; };
 		59C354D5196E0A89003BEFED /* MasksViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = MasksViewController.swift; sourceTree = "<group>"; };
 		59C354D6196E0A89003BEFED /* MasksViewController.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = MasksViewController.xib; sourceTree = "<group>"; };
 		59C4911F196818A8002F75E9 /* CABook.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = CABook.app; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -40,6 +60,10 @@
 		59C4913E19681A59002F75E9 /* ClockViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ClockViewController.swift; sourceTree = "<group>"; };
 		59C4913F19681A59002F75E9 /* ClockViewController.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = ClockViewController.xib; sourceTree = "<group>"; };
 		59C491421968E878002F75E9 /* ListViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ListViewController.swift; sourceTree = "<group>"; };
+		59FED01C19736E5A005B056E /* SublayerTransformViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SublayerTransformViewController.swift; sourceTree = "<group>"; };
+		59FED01D19736E5A005B056E /* SublayerTransformViewController.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = SublayerTransformViewController.xib; sourceTree = "<group>"; };
+		59FED020197371F7005B056E /* BackviewViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = BackviewViewController.swift; sourceTree = "<group>"; };
+		59FED021197371F7005B056E /* BackviewViewController.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = BackviewViewController.xib; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -60,11 +84,28 @@
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
+		5986AA5D1972AC95000F0835 /* Chapter 5 */ = {
+			isa = PBXGroup;
+			children = (
+				5986AA5E1972ACA9000F0835 /* PerspectiveViewController.swift */,
+				5986AA621972AE7A000F0835 /* PerspectiveViewController.xib */,
+				59FED01C19736E5A005B056E /* SublayerTransformViewController.swift */,
+				59FED01D19736E5A005B056E /* SublayerTransformViewController.xib */,
+				59FED020197371F7005B056E /* BackviewViewController.swift */,
+				59FED021197371F7005B056E /* BackviewViewController.xib */,
+				594B738E1974F99E004C2735 /* FlatteningViewController.swift */,
+				594B738F1974F99E004C2735 /* FlatteningViewController.xib */,
+			);
+			name = "Chapter 5";
+			sourceTree = "<group>";
+		};
 		59C354D4196E0A77003BEFED /* Chapter 4 */ = {
 			isa = PBXGroup;
 			children = (
 				59C354D5196E0A89003BEFED /* MasksViewController.swift */,
 				59C354D6196E0A89003BEFED /* MasksViewController.xib */,
+				5986AA5819725020000F0835 /* GroupOpacityViewController.swift */,
+				5986AA5919725020000F0835 /* GroupOpacityViewController.xib */,
 			);
 			name = "Chapter 4";
 			sourceTree = "<group>";
@@ -94,6 +135,8 @@
 				59C49124196818A8002F75E9 /* AppDelegate.swift */,
 				59C49126196818A8002F75E9 /* Images.xcassets */,
 				59C49122196818A8002F75E9 /* Supporting Files */,
+				594B738A1974F2CE004C2735 /* InfoViewController.swift */,
+				594B738B1974F2CE004C2735 /* InfoViewController.xib */,
 			);
 			path = CABook;
 			sourceTree = "<group>";
@@ -126,6 +169,7 @@
 		59C4913C196818DE002F75E9 /* Chapters */ = {
 			isa = PBXGroup;
 			children = (
+				5986AA5D1972AC95000F0835 /* Chapter 5 */,
 				59C354D4196E0A77003BEFED /* Chapter 4 */,
 				59C4913D196818E8002F75E9 /* Chapter 3 */,
 				59C491421968E878002F75E9 /* ListViewController.swift */,
@@ -221,9 +265,15 @@
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				5986AA5B19725020000F0835 /* GroupOpacityViewController.xib in Resources */,
 				59C49127196818A8002F75E9 /* Images.xcassets in Resources */,
+				594B738D1974F2CE004C2735 /* InfoViewController.xib in Resources */,
+				59FED01F19736E5A005B056E /* SublayerTransformViewController.xib in Resources */,
+				594B73911974F99E004C2735 /* FlatteningViewController.xib in Resources */,
 				59C354D8196E0A89003BEFED /* MasksViewController.xib in Resources */,
 				59C4914119681A59002F75E9 /* ClockViewController.xib in Resources */,
+				5986AA631972AE7A000F0835 /* PerspectiveViewController.xib in Resources */,
+				59FED023197371F7005B056E /* BackviewViewController.xib in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -243,7 +293,13 @@
 			files = (
 				59C49125196818A8002F75E9 /* AppDelegate.swift in Sources */,
 				59C4914019681A59002F75E9 /* ClockViewController.swift in Sources */,
+				594B73901974F99E004C2735 /* FlatteningViewController.swift in Sources */,
+				59FED022197371F7005B056E /* BackviewViewController.swift in Sources */,
 				59C354D7196E0A89003BEFED /* MasksViewController.swift in Sources */,
+				594B738C1974F2CE004C2735 /* InfoViewController.swift in Sources */,
+				5986AA5F1972ACA9000F0835 /* PerspectiveViewController.swift in Sources */,
+				5986AA5A19725020000F0835 /* GroupOpacityViewController.swift in Sources */,
+				59FED01E19736E5A005B056E /* SublayerTransformViewController.swift in Sources */,
 				59C491431968E878002F75E9 /* ListViewController.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
diff --git a/CABook/CABook.xcodeproj/project.xcworkspace/xcshareddata/CABook.xccheckout b/CABook/CABook.xcodeproj/project.xcworkspace/xcshareddata/CABook.xccheckout
new file mode 100644
index 0000000..8a2728a
--- /dev/null
+++ b/CABook/CABook.xcodeproj/project.xcworkspace/xcshareddata/CABook.xccheckout
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDESourceControlProjectFavoriteDictionaryKey</key>
+	<false/>
+	<key>IDESourceControlProjectIdentifier</key>
+	<string>76B40F24-0A8A-4B8B-B19F-8776DF1B98C8</string>
+	<key>IDESourceControlProjectName</key>
+	<string>CABook</string>
+	<key>IDESourceControlProjectOriginsDictionary</key>
+	<dict>
+		<key>3479137E-F792-485E-838F-B9CAB3A5010D</key>
+		<string>ssh://github.com/raheelahmad/CABook.git</string>
+	</dict>
+	<key>IDESourceControlProjectPath</key>
+	<string>CABook/CABook.xcodeproj/project.xcworkspace</string>
+	<key>IDESourceControlProjectRelativeInstallPathDictionary</key>
+	<dict>
+		<key>3479137E-F792-485E-838F-B9CAB3A5010D</key>
+		<string>../../..</string>
+	</dict>
+	<key>IDESourceControlProjectURL</key>
+	<string>ssh://github.com/raheelahmad/CABook.git</string>
+	<key>IDESourceControlProjectVersion</key>
+	<integer>110</integer>
+	<key>IDESourceControlProjectWCCIdentifier</key>
+	<string>3479137E-F792-485E-838F-B9CAB3A5010D</string>
+	<key>IDESourceControlProjectWCConfigurations</key>
+	<array>
+		<dict>
+			<key>IDESourceControlRepositoryExtensionIdentifierKey</key>
+			<string>public.vcs.git</string>
+			<key>IDESourceControlWCCIdentifierKey</key>
+			<string>3479137E-F792-485E-838F-B9CAB3A5010D</string>
+			<key>IDESourceControlWCCName</key>
+			<string>CABook</string>
+		</dict>
+	</array>
+</dict>
+</plist>
diff --git a/CABook/CABook.xcodeproj/project.xcworkspace/xcuserdata/raheel.xcuserdatad/UserInterfaceState.xcuserstate b/CABook/CABook.xcodeproj/project.xcworkspace/xcuserdata/raheel.xcuserdatad/UserInterfaceState.xcuserstate
index 0116b22..149abf2 100644
Binary files a/CABook/CABook.xcodeproj/project.xcworkspace/xcuserdata/raheel.xcuserdatad/UserInterfaceState.xcuserstate and b/CABook/CABook.xcodeproj/project.xcworkspace/xcuserdata/raheel.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/CABook/CABook/BackviewViewController.swift b/CABook/CABook/BackviewViewController.swift
new file mode 100644
index 0000000..af0426f
--- /dev/null
+++ b/CABook/CABook/BackviewViewController.swift
@@ -0,0 +1,59 @@
+//
+//  BackviewViewController.swift
+//  CABook
+//
+//  Created by Raheel Ahmad on 7/13/14.
+//  Copyright (c) 2014 Sakun Labs. All rights reserved.
+//
+
+import UIKit
+import QuartzCore
+
+@objc(BackviewViewController) class BackviewViewController: UIViewController {
+
+    @IBOutlet strong var tajView: UIImageView!
+    
+    var timer: NSTimer?
+    var tickCount = 0
+    
+    @IBAction func switchDoubleSidedness(sender: UISwitch) {
+        tajView.layer.doubleSided = sender.on
+    }
+    
+    @IBAction func showInfo(sender: AnyObject) {
+        let info = "The doubleSided property controls whether the layer's back view (when rotated by 180° on its x or y axis) is a mirror of its front contents or not."
+        let infoVC = InfoViewController(info: info)
+        presentViewController(infoVC, animated: true, completion: nil)
+    }
+    
+    override func viewWillAppear(animated: Bool) {
+        super.viewWillAppear(animated)
+        tajView.layer.borderColor = UIColor.darkGrayColor().CGColor
+        tajView.layer.borderWidth = 1.0
+        animate()
+    }
+    
+    override func viewWillDisappear(animated: Bool) {
+        super.viewWillDisappear(animated)
+        timer!.invalidate()
+    }
+    
+    func animate() {
+        timer = NSTimer.scheduledTimerWithTimeInterval(0.01, target: self, selector: "tick", userInfo: nil, repeats: true)
+        tickCount = 0
+        tick()
+    }
+    
+    func tick() {
+        if tickCount > 360 {
+            tickCount = 0
+        }
+        let angle = Double(tickCount) * M_PI / 180
+        var transform = CATransform3DIdentity
+        transform.m34 = -1/500.0
+        transform = CATransform3DRotate(transform, CGFloat(angle), 0, 1, 0)
+        tajView.layer.transform = transform
+        
+        tickCount++
+    }
+}
diff --git a/CABook/CABook/BackviewViewController.xib b/CABook/CABook/BackviewViewController.xib
new file mode 100644
index 0000000..e45236b
--- /dev/null
+++ b/CABook/CABook/BackviewViewController.xib
@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6185.7" systemVersion="13D65" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6181.2"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="BackviewViewController" customModule="CABook" customModuleProvider="target">
+            <connections>
+                <outlet property="tajView" destination="Ysy-iS-Vlf" id="4FH-ge-FBM"/>
+                <outlet property="view" destination="i5M-Pr-FkT" id="sfx-zR-JGt"/>
+            </connections>
+        </placeholder>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <view clearsContextBeforeDrawing="NO" contentMode="scaleToFill" id="i5M-Pr-FkT">
+            <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
+            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+            <subviews>
+                <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="taj-mahal" translatesAutoresizingMaskIntoConstraints="NO" id="Ysy-iS-Vlf">
+                    <rect key="frame" x="90" y="127" width="300" height="225"/>
+                    <constraints>
+                        <constraint firstAttribute="height" constant="225" id="DFE-D6-OcP"/>
+                        <constraint firstAttribute="width" constant="300" id="N0W-oA-nPA"/>
+                    </constraints>
+                </imageView>
+                <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" on="YES" translatesAutoresizingMaskIntoConstraints="NO" id="rPL-q3-D4e">
+                    <rect key="frame" x="90" y="391" width="51" height="31"/>
+                    <connections>
+                        <action selector="switchDoubleSidedness:" destination="-1" eventType="valueChanged" id="35k-JA-4mm"/>
+                    </connections>
+                </switch>
+                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="DOUBLE SIDED" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="o97-KH-cpi">
+                    <rect key="frame" x="147" y="408" width="83" height="13.5"/>
+                    <fontDescription key="fontDescription" type="boldSystem" pointSize="11"/>
+                    <color key="textColor" red="0.0" green="0.47843137250000001" blue="1" alpha="1" colorSpace="calibratedRGB"/>
+                    <nil key="highlightedColor"/>
+                </label>
+                <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="infoDark" showsTouchWhenHighlighted="YES" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="sKQ-pX-Wkv">
+                    <rect key="frame" x="414" y="435" width="22" height="22"/>
+                    <state key="normal">
+                        <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
+                    </state>
+                    <connections>
+                        <action selector="showInfo:" destination="-1" eventType="touchUpInside" id="y8s-hn-3TE"/>
+                    </connections>
+                </button>
+            </subviews>
+            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+            <constraints>
+                <constraint firstAttribute="centerX" secondItem="Ysy-iS-Vlf" secondAttribute="centerX" id="3sy-Xt-wdm"/>
+                <constraint firstItem="rPL-q3-D4e" firstAttribute="top" secondItem="Ysy-iS-Vlf" secondAttribute="bottom" constant="39" id="9sw-yT-A7C"/>
+                <constraint firstAttribute="centerY" secondItem="Ysy-iS-Vlf" secondAttribute="centerY" constant="0.5" id="DFg-qB-Yv2"/>
+                <constraint firstItem="rPL-q3-D4e" firstAttribute="bottom" secondItem="o97-KH-cpi" secondAttribute="bottom" constant="0.5" id="HE2-xV-to4"/>
+                <constraint firstAttribute="bottom" secondItem="sKQ-pX-Wkv" secondAttribute="bottom" constant="23" id="HEa-uV-aTA"/>
+                <constraint firstItem="o97-KH-cpi" firstAttribute="leading" secondItem="rPL-q3-D4e" secondAttribute="trailing" constant="8" id="fQt-yr-KvM"/>
+                <constraint firstItem="rPL-q3-D4e" firstAttribute="leading" secondItem="Ysy-iS-Vlf" secondAttribute="leading" id="gTL-xn-29l"/>
+                <constraint firstAttribute="trailing" secondItem="sKQ-pX-Wkv" secondAttribute="trailing" constant="44" id="mPK-YW-cX2"/>
+            </constraints>
+        </view>
+    </objects>
+    <resources>
+        <image name="taj-mahal" width="300" height="225"/>
+    </resources>
+</document>
diff --git a/CABook/CABook/ClockViewController.xib b/CABook/CABook/ClockViewController.xib
index cce27e1..b5acfad 100644
--- a/CABook/CABook/ClockViewController.xib
+++ b/CABook/CABook/ClockViewController.xib
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6154.21" systemVersion="13D65" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6185.7" systemVersion="13D65" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6153.13"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6181.2"/>
     </dependencies>
     <objects>
         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="ClockViewController" customModule="CABook" customModuleProvider="target">
@@ -46,9 +46,7 @@
                 <constraint firstAttribute="centerX" secondItem="ewV-yu-MPk" secondAttribute="centerX" constant="-7" id="Drk-Xm-T1e"/>
                 <constraint firstAttribute="centerY" secondItem="ewV-yu-MPk" secondAttribute="centerY" constant="-10.5" id="pio-0D-k9L"/>
             </constraints>
-            <simulatedStatusBarMetrics key="simulatedStatusBarMetrics"/>
             <simulatedOrientationMetrics key="simulatedOrientationMetrics" orientation="landscapeRight"/>
-            <simulatedScreenMetrics key="simulatedDestinationMetrics" type="AbstractSizeClassScreen[default]"/>
         </view>
     </objects>
     <resources>
diff --git a/CABook/CABook/FlatteningViewController.swift b/CABook/CABook/FlatteningViewController.swift
new file mode 100644
index 0000000..0cc2f1a
--- /dev/null
+++ b/CABook/CABook/FlatteningViewController.swift
@@ -0,0 +1,48 @@
+//
+//  FlatteningViewController.swift
+//  CABook
+//
+//  Created by Raheel Ahmad on 7/14/14.
+//  Copyright (c) 2014 Sakun Labs. All rights reserved.
+//
+
+import UIKit
+import QuartzCore
+
+@objc(FlatteningViewController) class FlatteningViewController: UIViewController {
+    
+    enum Axis: Int {
+        case Z = 0
+        case X
+    }
+
+    @IBOutlet var outerView: UIView
+    @IBOutlet var innerView: UIView
+    @IBOutlet var `switch`: UISegmentedControl
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        applyRotation(nil)
+    }
+    
+    @IBAction func showInfo(sender: AnyObject) {
+        let info = "Applying an opposite transform to nested layers \"corrects\" them for rotations in X or Y axis. For 3D rotations (in Z axis) however, the correction doesn't apply. As the layer's sublayers are flattened, so the sublayer rotation doesn't have the cancelling effect."
+        let infoVC = InfoViewController(info: info)
+        presentViewController(infoVC, animated: true, completion: nil)
+    }
+
+    @IBAction func applyRotation(sender: AnyObject?) {
+        switch Axis.fromRaw(`switch`.selectedSegmentIndex) as Axis {
+        case Axis.Z:
+        outerView.layer.transform = CATransform3DMakeRotation(CGFloat(M_PI_4), 0, 0, 1)
+        innerView.layer.transform = CATransform3DMakeRotation(CGFloat(-M_PI_4), 0, 0, 1)
+        case .X:
+        outerView.layer.transform = CATransform3DMakeRotation(CGFloat(M_PI_4), 1, 0, 1)
+        innerView.layer.transform = CATransform3DMakeRotation(CGFloat(-M_PI_4), 1, 0, 1)
+        default:
+            break
+        }
+        
+    }
+}
diff --git a/CABook/CABook/FlatteningViewController.xib b/CABook/CABook/FlatteningViewController.xib
new file mode 100644
index 0000000..e8f7310
--- /dev/null
+++ b/CABook/CABook/FlatteningViewController.xib
@@ -0,0 +1,79 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6185.7" systemVersion="13D65" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6181.2"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="FlatteningViewController" customModule="CABook" customModuleProvider="target">
+            <connections>
+                <outlet property="innerView" destination="u9G-yz-Kq1" id="UXm-jy-Af1"/>
+                <outlet property="outerView" destination="fVX-FX-wWc" id="xTS-bM-adm"/>
+                <outlet property="switch" destination="Ib9-bp-7sd" id="jhR-tw-Cnm"/>
+                <outlet property="view" destination="i5M-Pr-FkT" id="sfx-zR-JGt"/>
+            </connections>
+        </placeholder>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <view clearsContextBeforeDrawing="NO" contentMode="scaleToFill" id="i5M-Pr-FkT">
+            <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
+            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+            <subviews>
+                <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="fVX-FX-wWc">
+                    <rect key="frame" x="150" y="150" width="180" height="180"/>
+                    <subviews>
+                        <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="u9G-yz-Kq1">
+                            <rect key="frame" x="30" y="29" width="120" height="120"/>
+                            <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                            <constraints>
+                                <constraint firstAttribute="height" constant="120" id="1N1-kE-28q"/>
+                                <constraint firstAttribute="width" constant="120" id="mhu-T1-d21"/>
+                            </constraints>
+                        </view>
+                    </subviews>
+                    <color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
+                    <constraints>
+                        <constraint firstAttribute="centerX" secondItem="u9G-yz-Kq1" secondAttribute="centerX" id="E36-U5-VTX"/>
+                        <constraint firstAttribute="height" constant="180" id="PaY-89-5QH"/>
+                        <constraint firstAttribute="width" constant="180" id="a1t-Ja-BvE"/>
+                        <constraint firstAttribute="centerY" secondItem="u9G-yz-Kq1" secondAttribute="centerY" constant="0.5" id="sJt-Hq-F3a"/>
+                    </constraints>
+                </view>
+                <segmentedControl opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="top" segmentControlStyle="plain" selectedSegmentIndex="0" translatesAutoresizingMaskIntoConstraints="NO" id="Ib9-bp-7sd">
+                    <rect key="frame" x="217" y="64" width="47" height="29"/>
+                    <segments>
+                        <segment title="Z"/>
+                        <segment title="X"/>
+                    </segments>
+                    <connections>
+                        <action selector="applyRotation:" destination="-1" eventType="valueChanged" id="f0E-8U-KJI"/>
+                    </connections>
+                </segmentedControl>
+                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="ROTATION AXIS" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Dwy-uI-nhC">
+                    <rect key="frame" x="126" y="72" width="83" height="13.5"/>
+                    <fontDescription key="fontDescription" type="boldSystem" pointSize="11"/>
+                    <color key="textColor" red="0.0" green="0.47843137250000001" blue="1" alpha="1" colorSpace="calibratedRGB"/>
+                    <nil key="highlightedColor"/>
+                </label>
+                <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="infoLight" showsTouchWhenHighlighted="YES" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="LPh-go-6Qi">
+                    <rect key="frame" x="438" y="438" width="22" height="22"/>
+                    <state key="normal">
+                        <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
+                    </state>
+                    <connections>
+                        <action selector="showInfo:" destination="-1" eventType="touchUpInside" id="zq9-8A-4mv"/>
+                    </connections>
+                </button>
+            </subviews>
+            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+            <constraints>
+                <constraint firstAttribute="bottom" secondItem="LPh-go-6Qi" secondAttribute="bottom" constant="20" id="Fs1-aB-MwK"/>
+                <constraint firstAttribute="centerX" secondItem="Ib9-bp-7sd" secondAttribute="centerX" constant="-0.5" id="YUf-pj-gnM"/>
+                <constraint firstItem="Ib9-bp-7sd" firstAttribute="top" secondItem="i5M-Pr-FkT" secondAttribute="top" constant="64" id="de6-7l-h8P"/>
+                <constraint firstAttribute="trailing" secondItem="LPh-go-6Qi" secondAttribute="trailing" constant="20" id="lgU-pU-9CV"/>
+                <constraint firstItem="Dwy-uI-nhC" firstAttribute="centerY" secondItem="Ib9-bp-7sd" secondAttribute="centerY" constant="0.75" id="mk5-mL-PYY"/>
+                <constraint firstAttribute="centerX" secondItem="fVX-FX-wWc" secondAttribute="centerX" constant="-0.5" id="pfC-O2-3qo"/>
+                <constraint firstItem="Ib9-bp-7sd" firstAttribute="leading" secondItem="Dwy-uI-nhC" secondAttribute="trailing" constant="8" id="rH1-Tc-hJy"/>
+                <constraint firstAttribute="centerY" secondItem="fVX-FX-wWc" secondAttribute="centerY" id="u76-O6-BrI"/>
+            </constraints>
+        </view>
+    </objects>
+</document>
diff --git a/CABook/CABook/GroupOpacityViewController.swift b/CABook/CABook/GroupOpacityViewController.swift
new file mode 100644
index 0000000..5f991ab
--- /dev/null
+++ b/CABook/CABook/GroupOpacityViewController.swift
@@ -0,0 +1,47 @@
+//
+//  GroupOpacityViewController.swift
+//  CABook
+//
+//  Created by Raheel Ahmad on 7/12/14.
+//  Copyright (c) 2014 Sakun Labs. All rights reserved.
+//
+
+import UIKit
+
+@objc(GroupOpacityViewController) class GroupOpacityViewController: UIViewController {
+
+    @IBOutlet var topButton: UIButton
+    @IBOutlet var bottomButton: UIButton
+    
+    convenience init() {
+        self.init(nibName: "GroupOpacityViewController", bundle: nil)
+    }
+
+    init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
+        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
+    }
+    
+    func setupButtons() {
+        for btn in [ topButton, bottomButton ] {
+            let w = btn.bounds.width
+            let h = btn.bounds.height
+            let someLabel = UILabel(frame: CGRectMake(0, h/2 - 10, w, 20))
+            someLabel.text = "Button Label"
+            someLabel.backgroundColor = UIColor.whiteColor()
+            someLabel.textAlignment = .Center
+            btn.addSubview(someLabel)
+        }
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        setupButtons()
+        topButton.layer.opacity = 0.5
+        
+        bottomButton.layer.shouldRasterize = true
+        bottomButton.layer.rasterizationScale = UIScreen.mainScreen().scale
+        bottomButton.layer.opacity = 0.5
+    }
+
+}
diff --git a/CABook/CABook/GroupOpacityViewController.xib b/CABook/CABook/GroupOpacityViewController.xib
new file mode 100644
index 0000000..5635c5e
--- /dev/null
+++ b/CABook/CABook/GroupOpacityViewController.xib
@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6185.7" systemVersion="13D65" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6181.2"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="GroupOpacityViewController" customModule="CABook" customModuleProvider="target">
+            <connections>
+                <outlet property="bottomButton" destination="UV3-dH-KtE" id="byT-zp-43M"/>
+                <outlet property="topButton" destination="Zcb-sU-FUE" id="JFB-RB-gaQ"/>
+                <outlet property="view" destination="i5M-Pr-FkT" id="sfx-zR-JGt"/>
+            </connections>
+        </placeholder>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <view clearsContextBeforeDrawing="NO" contentMode="scaleToFill" id="i5M-Pr-FkT">
+            <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
+            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+            <subviews>
+                <imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="pattern" translatesAutoresizingMaskIntoConstraints="NO" id="gGh-eg-JGD">
+                    <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
+                </imageView>
+                <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="Zcb-sU-FUE">
+                    <rect key="frame" x="186" y="80" width="119" height="55"/>
+                    <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                    <constraints>
+                        <constraint firstAttribute="height" constant="55" id="imt-Kn-iNH"/>
+                        <constraint firstAttribute="width" constant="119" id="qwS-Pj-3xh"/>
+                    </constraints>
+                    <state key="normal">
+                        <color key="titleColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                        <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
+                    </state>
+                </button>
+                <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="UV3-dH-KtE">
+                    <rect key="frame" x="186" y="204" width="119" height="55"/>
+                    <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                    <state key="normal">
+                        <color key="titleColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                        <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
+                    </state>
+                </button>
+            </subviews>
+            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+            <constraints>
+                <constraint firstAttribute="bottom" secondItem="gGh-eg-JGD" secondAttribute="bottom" id="7sB-U5-yZd"/>
+                <constraint firstItem="UV3-dH-KtE" firstAttribute="centerX" secondItem="Zcb-sU-FUE" secondAttribute="centerX" id="FUP-8T-SMy"/>
+                <constraint firstItem="gGh-eg-JGD" firstAttribute="leading" secondItem="i5M-Pr-FkT" secondAttribute="leading" id="JIE-Sl-ifL"/>
+                <constraint firstItem="Zcb-sU-FUE" firstAttribute="top" secondItem="i5M-Pr-FkT" secondAttribute="top" constant="80" id="Jcb-L4-7sc"/>
+                <constraint firstItem="UV3-dH-KtE" firstAttribute="top" secondItem="Zcb-sU-FUE" secondAttribute="bottom" constant="69" id="QGi-2R-uM5"/>
+                <constraint firstItem="UV3-dH-KtE" firstAttribute="width" secondItem="Zcb-sU-FUE" secondAttribute="width" id="Riv-1c-VyS"/>
+                <constraint firstAttribute="centerX" secondItem="Zcb-sU-FUE" secondAttribute="centerX" constant="-5.5" id="eDD-9Z-t7t"/>
+                <constraint firstAttribute="trailing" secondItem="gGh-eg-JGD" secondAttribute="trailing" id="r5W-E2-gXg"/>
+                <constraint firstItem="UV3-dH-KtE" firstAttribute="height" secondItem="Zcb-sU-FUE" secondAttribute="height" id="rBY-KN-wDd"/>
+                <constraint firstItem="gGh-eg-JGD" firstAttribute="top" secondItem="i5M-Pr-FkT" secondAttribute="top" id="tnm-lb-g0l"/>
+            </constraints>
+        </view>
+    </objects>
+    <resources>
+        <image name="pattern" width="320" height="568"/>
+    </resources>
+</document>
diff --git a/CABook/CABook/Images.xcassets/pattern.imageset/Contents.json b/CABook/CABook/Images.xcassets/pattern.imageset/Contents.json
new file mode 100644
index 0000000..f6e31ee
--- /dev/null
+++ b/CABook/CABook/Images.xcassets/pattern.imageset/Contents.json
@@ -0,0 +1,20 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x",
+      "filename" : "pattern.png"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
\ No newline at end of file
diff --git a/CABook/CABook/Images.xcassets/pattern.imageset/pattern.png b/CABook/CABook/Images.xcassets/pattern.imageset/pattern.png
new file mode 100644
index 0000000..534cad4
Binary files /dev/null and b/CABook/CABook/Images.xcassets/pattern.imageset/pattern.png differ
diff --git a/CABook/CABook/InfoViewController.swift b/CABook/CABook/InfoViewController.swift
new file mode 100644
index 0000000..be30393
--- /dev/null
+++ b/CABook/CABook/InfoViewController.swift
@@ -0,0 +1,37 @@
+//
+//  InfoViewController.swift
+//  CABook
+//
+//  Created by Raheel Ahmad on 7/14/14.
+//  Copyright (c) 2014 Sakun Labs. All rights reserved.
+//
+
+import UIKit
+
+class InfoViewController: UIViewController {
+    var info: String?
+    
+    @IBOutlet var textView: UITextView
+    convenience init(info: String) {
+        self.init()
+        self.info = info
+    }
+    
+    override func viewWillAppear(animated: Bool) {
+        super.viewWillAppear(animated)
+        
+        textView.text = info
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        // Do any additional setup after loading the view.
+    }
+}
+
+extension InfoViewController {
+    @IBAction func done(sender: AnyObject) {
+        dismissViewControllerAnimated(true, completion: nil)
+    }
+}
diff --git a/CABook/CABook/InfoViewController.xib b/CABook/CABook/InfoViewController.xib
new file mode 100644
index 0000000..ea644a3
--- /dev/null
+++ b/CABook/CABook/InfoViewController.xib
@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6185.7" systemVersion="13D65" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6181.2"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="InfoViewController" customModule="CABook" customModuleProvider="target">
+            <connections>
+                <outlet property="textView" destination="RZl-LU-42G" id="3pr-Xu-8Pj"/>
+                <outlet property="view" destination="i5M-Pr-FkT" id="sfx-zR-JGt"/>
+            </connections>
+        </placeholder>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <view clearsContextBeforeDrawing="NO" contentMode="scaleToFill" id="i5M-Pr-FkT">
+            <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
+            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+            <subviews>
+                <textView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" ambiguous="YES" translatesAutoresizingMaskIntoConstraints="NO" id="RZl-LU-42G">
+                    <rect key="frame" x="31" y="88" width="408" height="372"/>
+                    <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                    <string key="text">Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Nam liber te conscient to factor tum poen legum odioque civiuda.</string>
+                    <fontDescription key="fontDescription" type="system" pointSize="14"/>
+                    <textInputTraits key="textInputTraits" autocapitalizationType="sentences"/>
+                </textView>
+                <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="Luy-Mk-qZn">
+                    <rect key="frame" x="402" y="20" width="37" height="30"/>
+                    <state key="normal" title="Done">
+                        <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
+                    </state>
+                    <connections>
+                        <action selector="done:" destination="-1" eventType="touchUpInside" id="Roh-nC-BC8"/>
+                    </connections>
+                </button>
+            </subviews>
+            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+            <constraints>
+                <constraint firstAttribute="trailing" secondItem="RZl-LU-42G" secondAttribute="trailing" constant="41" id="KtD-bA-rFT"/>
+                <constraint firstAttribute="bottom" secondItem="RZl-LU-42G" secondAttribute="bottom" constant="20" id="OhQ-X7-HBu"/>
+                <constraint firstAttribute="trailing" secondItem="Luy-Mk-qZn" secondAttribute="trailing" constant="41" id="QQ8-lq-LXa"/>
+                <constraint firstItem="RZl-LU-42G" firstAttribute="leading" secondItem="i5M-Pr-FkT" secondAttribute="leading" constant="31" id="YtI-sY-t4K"/>
+                <constraint firstItem="RZl-LU-42G" firstAttribute="top" secondItem="i5M-Pr-FkT" secondAttribute="top" constant="88" id="fV5-DO-R9f"/>
+                <constraint firstItem="Luy-Mk-qZn" firstAttribute="top" secondItem="i5M-Pr-FkT" secondAttribute="top" constant="20" id="jWQ-ac-vkg"/>
+            </constraints>
+        </view>
+    </objects>
+</document>
diff --git a/CABook/CABook/ListViewController.swift b/CABook/CABook/ListViewController.swift
index 84d9fb0..fbc07e3 100644
--- a/CABook/CABook/ListViewController.swift
+++ b/CABook/CABook/ListViewController.swift
@@ -12,7 +12,8 @@ struct List {
     static let chapters =
 		[
             [chapterKey: "Chapter 3", exercisesKey: [ "Clock" ]],
-            [chapterKey: "Chapter 4", exercisesKey: [ "Masks" ]],
+            [chapterKey: "Chapter 4", exercisesKey: [ "Masks", "GroupOpacity" ]],
+            [chapterKey: "Chapter 5", exercisesKey: [ "Perspective", "SublayerTransform", "Backview", "Flattening" ]],
         ]
 	static let nameKey = "name"
 	static let chapterKey = "chapterName"
diff --git a/CABook/CABook/PerspectiveViewController.swift b/CABook/CABook/PerspectiveViewController.swift
new file mode 100644
index 0000000..5d45bf6
--- /dev/null
+++ b/CABook/CABook/PerspectiveViewController.swift
@@ -0,0 +1,64 @@
+//
+//  PerspectiveViewController.swift
+//  CABook
+//
+//  Created by Raheel Ahmad on 7/13/14.
+//  Copyright (c) 2014 Sakun Labs. All rights reserved.
+//
+
+import UIKit
+import QuartzCore
+
+@objc(PerspectiveViewController) class PerspectiveViewController: UIViewController {
+
+    @IBOutlet strong var tajWidthConstraint: NSLayoutConstraint!
+    @IBOutlet strong var tajHeightConstraint: NSLayoutConstraint!
+    @IBOutlet var tajView: UIImageView
+    @IBOutlet var slider: UISlider
+    var hConstraints: [NSLayoutConstraint] = []
+    var wConstraints: [NSLayoutConstraint] = []
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        addInfoButton()
+    }
+
+    @IBAction func sliderValueChanged(sender: AnyObject) {
+        view.removeConstraint(tajWidthConstraint)
+        view.removeConstraint(tajHeightConstraint)
+        
+        let fraction = slider.value
+        let value = 500.0 + fraction * (1000 - 500)
+        
+        var transform = CATransform3DIdentity
+        transform.m34 = -1.0/value
+        transform = CATransform3DRotate(transform, CGFloat(M_PI_4), 0, 1, 0)
+        
+        tajView.layer.transform = transform
+    }
+    
+    func addInfoButton() {
+        let view = self.view
+        
+        let w = view.bounds.size.width
+        let h = view.bounds.size.height
+        let button = UIButton.buttonWithType(.InfoDark) as UIButton
+        button.setTranslatesAutoresizingMaskIntoConstraints(false)
+        button.addTarget(self, action: "showInfo", forControlEvents: .TouchUpInside)
+        view.addSubview(button)
+        
+        let vd = [ "view": view, "button": button ]
+        let md = [ "width": 24, "spacing": 10 ]
+        view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:[button(width)]-spacing-|", options: nil, metrics: md, views: vd))
+        view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[button(width)]-spacing-|", options: nil, metrics: md, views: vd))
+    }
+    
+    func showInfo() {
+        let vc = UIViewController()
+        let w = view.bounds.size.width
+        let h = view.bounds.size.height
+        vc.view.frame = CGRect(x: 0, y: h - 140, width: w, height: 140)
+        vc.view.backgroundColor = UIColor.redColor()
+        self.presentViewController(vc, animated: true, completion: nil)
+    }
+}
diff --git a/CABook/CABook/PerspectiveViewController.xib b/CABook/CABook/PerspectiveViewController.xib
new file mode 100644
index 0000000..dadc929
--- /dev/null
+++ b/CABook/CABook/PerspectiveViewController.xib
@@ -0,0 +1,73 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6185.7" systemVersion="13D65" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6181.2"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="PerspectiveViewController">
+            <connections>
+                <outlet property="slider" destination="vOR-gp-HNL" id="SfY-lf-zIO"/>
+                <outlet property="tajHeightConstraint" destination="YHz-bM-j5s" id="tgW-sY-49z"/>
+                <outlet property="tajView" destination="HUa-Cg-VNL" id="cYT-Iu-0ay"/>
+                <outlet property="tajWidthConstraint" destination="GGU-75-SUL" id="Der-RX-7P4"/>
+                <outlet property="view" destination="iN0-l3-epB" id="bbc-gH-h0a"/>
+            </connections>
+        </placeholder>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <view contentMode="scaleToFill" id="iN0-l3-epB">
+            <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
+            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+            <subviews>
+                <imageView userInteractionEnabled="NO" contentMode="scaleAspectFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="taj-mahal" translatesAutoresizingMaskIntoConstraints="NO" id="HUa-Cg-VNL">
+                    <rect key="frame" x="121" y="120" width="239" height="239"/>
+                    <constraints>
+                        <constraint firstAttribute="width" constant="239" id="GGU-75-SUL"/>
+                        <constraint firstAttribute="height" constant="239" id="YHz-bM-j5s"/>
+                    </constraints>
+                </imageView>
+                <slider opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" minValue="0.0" maxValue="1" translatesAutoresizingMaskIntoConstraints="NO" id="vOR-gp-HNL">
+                    <rect key="frame" x="119" y="385" width="243" height="31"/>
+                    <connections>
+                        <action selector="sliderValueChanged:" destination="-1" eventType="valueChanged" id="Xu5-9c-dOa"/>
+                    </connections>
+                </slider>
+                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="PERSPECTIVE DISTANCE" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="oaP-PS-sK0">
+                    <rect key="frame" x="185" y="446" width="134" height="13.5"/>
+                    <fontDescription key="fontDescription" type="boldSystem" pointSize="11"/>
+                    <color key="textColor" red="0.0" green="0.47843137250000001" blue="1" alpha="1" colorSpace="calibratedRGB"/>
+                    <nil key="highlightedColor"/>
+                </label>
+                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="500" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Dp8-Zx-ie8">
+                    <rect key="frame" x="121" y="422" width="19" height="13.5"/>
+                    <fontDescription key="fontDescription" type="boldSystem" pointSize="11"/>
+                    <color key="textColor" red="0.0" green="0.47843137250000001" blue="1" alpha="1" colorSpace="calibratedRGB"/>
+                    <nil key="highlightedColor"/>
+                </label>
+                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="1000" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="0Ca-x5-E8w">
+                    <rect key="frame" x="335" y="422" width="25" height="13.5"/>
+                    <fontDescription key="fontDescription" type="boldSystem" pointSize="11"/>
+                    <color key="textColor" red="0.0" green="0.47843137250000001" blue="1" alpha="1" colorSpace="calibratedRGB"/>
+                    <nil key="highlightedColor"/>
+                </label>
+            </subviews>
+            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+            <constraints>
+                <constraint firstItem="0Ca-x5-E8w" firstAttribute="leading" secondItem="Dp8-Zx-ie8" secondAttribute="trailing" constant="195" id="6Ms-LC-BTU"/>
+                <constraint firstAttribute="centerY" secondItem="HUa-Cg-VNL" secondAttribute="centerY" constant="0.5" id="GOn-fP-zeo"/>
+                <constraint firstItem="oaP-PS-sK0" firstAttribute="centerX" secondItem="vOR-gp-HNL" secondAttribute="centerX" constant="11.5" id="PB7-eP-Yo9"/>
+                <constraint firstItem="Dp8-Zx-ie8" firstAttribute="top" secondItem="0Ca-x5-E8w" secondAttribute="top" id="RdV-pJ-Ed3"/>
+                <constraint firstAttribute="centerX" secondItem="HUa-Cg-VNL" secondAttribute="centerX" constant="-0.5" id="SeK-70-Mmm"/>
+                <constraint firstItem="Dp8-Zx-ie8" firstAttribute="leading" secondItem="vOR-gp-HNL" secondAttribute="leading" id="c4N-Xc-GMj"/>
+                <constraint firstItem="oaP-PS-sK0" firstAttribute="top" secondItem="vOR-gp-HNL" secondAttribute="bottom" constant="31" id="cFf-Np-v4X"/>
+                <constraint firstItem="Dp8-Zx-ie8" firstAttribute="top" secondItem="vOR-gp-HNL" secondAttribute="bottom" constant="7" id="e5o-uK-gah"/>
+                <constraint firstItem="HUa-Cg-VNL" firstAttribute="trailing" secondItem="vOR-gp-HNL" secondAttribute="trailing" id="fv2-8O-50S"/>
+                <constraint firstItem="HUa-Cg-VNL" firstAttribute="leading" secondItem="vOR-gp-HNL" secondAttribute="leading" id="gO5-Hx-ytQ"/>
+                <constraint firstItem="vOR-gp-HNL" firstAttribute="top" secondItem="HUa-Cg-VNL" secondAttribute="bottom" constant="26" id="gn3-aP-A4j"/>
+            </constraints>
+            <simulatedOrientationMetrics key="simulatedOrientationMetrics" orientation="landscapeRight"/>
+        </view>
+    </objects>
+    <resources>
+        <image name="taj-mahal" width="300" height="225"/>
+    </resources>
+</document>
diff --git a/CABook/CABook/SublayerTransformViewController.swift b/CABook/CABook/SublayerTransformViewController.swift
new file mode 100644
index 0000000..9b0486f
--- /dev/null
+++ b/CABook/CABook/SublayerTransformViewController.swift
@@ -0,0 +1,31 @@
+//
+//  SublayerTransformViewController.swift
+//  CABook
+//
+//  Created by Raheel Ahmad on 7/13/14.
+//  Copyright (c) 2014 Sakun Labs. All rights reserved.
+//
+
+import UIKit
+import QuartzCore
+
+@objc(SublayerTransformViewController) class SublayerTransformViewController: UIViewController {
+
+    @IBOutlet strong var taj1: UIImageView!
+    @IBOutlet strong var taj2: UIImageView!
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        applyTransform()
+    }
+    
+    func applyTransform() {
+        var transform = CATransform3DIdentity
+        transform.m34 = -1.0/500.0
+        view.layer.sublayerTransform = transform
+        
+        taj1.layer.transform = CATransform3DRotate(transform, -CGFloat(M_PI_4), 0, 1, 0)
+        taj2.layer.transform = CATransform3DRotate(transform, CGFloat(M_PI_4), 0, 1, 0)
+    }
+
+}
diff --git a/CABook/CABook/SublayerTransformViewController.xib b/CABook/CABook/SublayerTransformViewController.xib
new file mode 100644
index 0000000..11e491f
--- /dev/null
+++ b/CABook/CABook/SublayerTransformViewController.xib
@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6185.7" systemVersion="13D65" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6181.2"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="SublayerTransformViewController" customModule="CABook" customModuleProvider="target">
+            <connections>
+                <outlet property="taj1" destination="K3b-nm-ttX" id="B9G-dz-PGv"/>
+                <outlet property="taj2" destination="UoA-c4-2Lq" id="hv4-KE-kbo"/>
+                <outlet property="view" destination="i5M-Pr-FkT" id="sfx-zR-JGt"/>
+            </connections>
+        </placeholder>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <view clearsContextBeforeDrawing="NO" contentMode="scaleToFill" id="i5M-Pr-FkT">
+            <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
+            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+            <subviews>
+                <imageView userInteractionEnabled="NO" contentMode="scaleAspectFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="taj-mahal" translatesAutoresizingMaskIntoConstraints="NO" id="K3b-nm-ttX">
+                    <rect key="frame" x="20" y="190" width="80" height="100"/>
+                    <constraints>
+                        <constraint firstAttribute="height" constant="100" id="TAk-iM-yrI"/>
+                        <constraint firstAttribute="width" constant="80" id="iz6-yo-Gku"/>
+                    </constraints>
+                </imageView>
+                <imageView userInteractionEnabled="NO" contentMode="scaleAspectFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="taj-mahal" translatesAutoresizingMaskIntoConstraints="NO" id="UoA-c4-2Lq">
+                    <rect key="frame" x="380" y="190" width="80" height="100"/>
+                    <constraints>
+                        <constraint firstAttribute="height" constant="100" id="770-cS-IeS"/>
+                        <constraint firstAttribute="width" constant="80" id="YY0-k6-LK7"/>
+                    </constraints>
+                </imageView>
+            </subviews>
+            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+            <constraints>
+                <constraint firstAttribute="trailing" secondItem="UoA-c4-2Lq" secondAttribute="trailing" constant="20" id="6eb-iK-EFR"/>
+                <constraint firstItem="K3b-nm-ttX" firstAttribute="leading" secondItem="i5M-Pr-FkT" secondAttribute="leading" constant="20" id="SNz-3I-44v"/>
+                <constraint firstAttribute="centerY" secondItem="UoA-c4-2Lq" secondAttribute="centerY" id="Y4V-K3-Aew"/>
+                <constraint firstAttribute="centerY" secondItem="K3b-nm-ttX" secondAttribute="centerY" id="sri-HU-dfs"/>
+            </constraints>
+        </view>
+    </objects>
+    <resources>
+        <image name="taj-mahal" width="300" height="225"/>
+    </resources>
+</document>