Assorted tests of tiling backgrounds or rendering with a shader, trying to see what happens when you surround a node with a photo frame, as would be used to compose a greeting card. That's one potential popular use for Touchgram.
Tap to circle through the various scenes.
Apple has a huge framework GamePlayKit for building much of the structure of games. It includes a family of Procedural Noise Generators. These are not being used in this sample at this time but may be revisited.
Uses ShaderKitExtensions.swift from twoStraws