diff --git a/documentation/BUILTIN.md b/documentation/BUILTIN.md
index 657f9245..852be8de 100644
--- a/documentation/BUILTIN.md
+++ b/documentation/BUILTIN.md
@@ -366,6 +366,9 @@ Prepend an interval at the beginning of the current/given scale.
 ### warn(*...args*)
 Print the arguments to the console with "warning" emphasis.
 
+### wilsonHeight(*interval*)
+Calculate the Wilson height of the interval. Sum of prime absolute factors with repetition..
+
 ### withEquave(*val*, *equave*)
 Change the equave of the val.
 
@@ -420,10 +423,10 @@ Calculate the geometric difference of two intervals on a circle.
 Calculate the geometric distance of two intervals on a circle.
 
 ### coalesce(*tolerance = 3.5*, *action = "simplest"*, *preserveBoundary = false*, *scale = $$*)
-Coalesce intervals in the current/given scale separated by `tolerance` (default 3.5 cents) into one.    `action` is one of 'simplest', 'lowest', 'highest', 'avg', 'havg' or 'geoavg' defaulting to 'simplest'.   If `preserveBoundary` is `true` intervals close to unison and the equave are not eliminated.
+Coalesce intervals in the current/given scale separated by `tolerance` (default 3.5 cents) into one.    `action` is one of 'simplest', 'wilson', 'lowest', 'highest', 'avg', 'havg' or 'geoavg' defaulting to 'simplest'.   If `preserveBoundary` is `true` intervals close to unison and the equave are not eliminated.
 
 ### coalesced(*tolerance = 3.5*, *action = "simplest"*, *preserveBoundary = false*, *scale = $$*)
-Obtain a copy of the current/given scale where groups of intervals separated by `tolerance` are coalesced into one.  `action` is one of 'simplest', 'lowest', 'highest', 'avg', 'havg' or 'geoavg'.  If `preserveBoundary` is `true` intervals close to unison and the equave are not eliminated.
+Obtain a copy of the current/given scale where groups of intervals separated by `tolerance` are coalesced into one.  `action` is one of 'simplest', 'wilson', 'lowest', 'highest', 'avg', 'havg' or 'geoavg'.  If `preserveBoundary` is `true` intervals close to unison and the equave are not eliminated.
 
 ### colorsOf(*scale = $$*)
 Obtain an array of colors of the current/given scale.
diff --git a/package-lock.json b/package-lock.json
index 90a796b6..95e94217 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
       "license": "MIT",
       "dependencies": {
         "moment-of-symmetry": "^0.4.2",
-        "xen-dev-utils": "^0.4.0"
+        "xen-dev-utils": "^0.5.0"
       },
       "bin": {
         "sonic-weave": "bin/sonic-weave.js"
@@ -4444,9 +4444,9 @@
       }
     },
     "node_modules/xen-dev-utils": {
-      "version": "0.4.0",
-      "resolved": "https://registry.npmjs.org/xen-dev-utils/-/xen-dev-utils-0.4.0.tgz",
-      "integrity": "sha512-wABrZPEIx09lk3bDf40gB8G1YrUNo9luqQmDViCkxjmzvkyjgwm5pw0Kl/QWyI1f/tAA+sBZxEIjJvWPI2VUbw==",
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/xen-dev-utils/-/xen-dev-utils-0.5.0.tgz",
+      "integrity": "sha512-6dRxq8xfVzDOqhitBJPQr2iVHtn4aXEJ8twGGkMCaR25S/MRqB8R/7xOMIH3VqN/cGmgRitibHEYOwnV0o78cg==",
       "engines": {
         "node": ">=10.6.0"
       },
diff --git a/package.json b/package.json
index be47ba1f..215a1710 100644
--- a/package.json
+++ b/package.json
@@ -68,7 +68,7 @@
   },
   "dependencies": {
     "moment-of-symmetry": "^0.4.2",
-    "xen-dev-utils": "^0.4.0"
+    "xen-dev-utils": "^0.5.0"
   },
   "engines": {
     "node": ">=12.0.0"
diff --git a/scripts/builtin-docs.ts b/scripts/builtin-docs.ts
index f4062546..faa43cbd 100644
--- a/scripts/builtin-docs.ts
+++ b/scripts/builtin-docs.ts
@@ -1,9 +1,9 @@
 import {stdout} from 'process';
-import {getSourceVisitor} from '../src/parser';
+import {getGlobalVisitor} from '../src/parser';
 import {SonicWeaveFunction} from '../src/stdlib';
 import {expressionToString} from '../src/ast';
 
-const visitor = getSourceVisitor();
+const visitor = getGlobalVisitor();
 
 stdout.write('# SonicWeave standard library\n');
 stdout.write(
diff --git a/src/parser/__tests__/expression.spec.ts b/src/parser/__tests__/expression.spec.ts
index fc62ae4a..6df4ae19 100644
--- a/src/parser/__tests__/expression.spec.ts
+++ b/src/parser/__tests__/expression.spec.ts
@@ -2262,4 +2262,14 @@ describe('Poor grammar / Fun with "<"', () => {
     expect(oof[0].valueOf()).toBe(1);
     expect(oof[1].a.valueOf()).toBe(2);
   });
+
+  it('can measure the Wilson complexity of 11/8', () => {
+    const {fraction} = parseSingle('wilsonHeight(11/8)');
+    expect(fraction).toBe('17');
+  });
+
+  it('can measure the Wilson complexity of 1073741820', () => {
+    const {fraction} = parseSingle('wilsonHeight(1073741820)');
+    expect(fraction).toBe((2 + 2 + 3 + 5 + 29 + 43 + 113 + 127).toString());
+  });
 });
diff --git a/src/parser/__tests__/stdlib.spec.ts b/src/parser/__tests__/stdlib.spec.ts
index 79fb1350..f6afae19 100644
--- a/src/parser/__tests__/stdlib.spec.ts
+++ b/src/parser/__tests__/stdlib.spec.ts
@@ -1308,6 +1308,11 @@ describe('SonicWeave standard library', () => {
     expect(scale).toEqual(['4096/4095', '3/2', '4095/2048', '2/1']);
   });
 
+  it('coalesces based on wilson height', () => {
+    const scale = expand('70/69;37/36;P5;2;coalesce(23., "wilson")');
+    expect(scale).toEqual(['70/69', 'P5', '2']);
+  });
+
   it('calculates Euler-Fokker genus 444', () => {
     const scale = expand('eulerGenus(444)');
     expect(scale).toEqual(['37/32', '3/2', '111/64', '2']);
diff --git a/src/parser/__tests__/vector-broadcasting.spec.ts b/src/parser/__tests__/vector-broadcasting.spec.ts
index 03dd966b..20a836f6 100644
--- a/src/parser/__tests__/vector-broadcasting.spec.ts
+++ b/src/parser/__tests__/vector-broadcasting.spec.ts
@@ -320,6 +320,7 @@ describe('SonicWeave vector broadcasting', () => {
     'JIP',
     'PrimeMapping(1200., 1902.)',
     'tenneyHeight',
+    'wilsonHeight',
     'floor',
     'round',
     'trunc',
diff --git a/src/stdlib/builtin.ts b/src/stdlib/builtin.ts
index 1604251b..e7e1c89d 100644
--- a/src/stdlib/builtin.ts
+++ b/src/stdlib/builtin.ts
@@ -53,6 +53,7 @@ import {
   absolute as pubAbsolute,
   relative as pubRelative,
   tenneyHeight as pubTenney,
+  wilsonHeight as pubWilson,
   track as pubTrack,
   sort as pubSort,
   repr as pubRepr,
@@ -1372,6 +1373,21 @@ tenneyHeight.__doc__ =
   'Calculate the Tenney height of the interval. Natural logarithm of numerator times denominator.';
 tenneyHeight.__node__ = builtinNode(tenneyHeight);
 
+// TODO: Wilson in cosJIP, nthPrime, primeRange, primeMonzo
+function wilsonHeight(
+  this: ExpressionVisitor,
+  interval: SonicWeaveValue
+): SonicWeaveValue {
+  requireParameters({interval});
+  if (typeof interval === 'boolean' || interval instanceof Interval) {
+    return pubWilson.bind(this)(interval);
+  }
+  return unaryBroadcast.bind(this)(interval, wilsonHeight.bind(this));
+}
+wilsonHeight.__doc__ =
+  'Calculate the Wilson height of the interval. Sum of prime absolute factors with repetition..';
+wilsonHeight.__node__ = builtinNode(wilsonHeight);
+
 function gcd(
   this: ExpressionVisitor,
   x: SonicWeaveValue,
@@ -2277,6 +2293,7 @@ export const BUILTIN_CONTEXT: Record<string, Interval | SonicWeaveFunction> = {
   JIP,
   PrimeMapping,
   tenneyHeight,
+  wilsonHeight,
   gcd,
   lcm,
   hasConstantStructure: hasConstantStructure_,
diff --git a/src/stdlib/prelude.ts b/src/stdlib/prelude.ts
index ae06e035..dab5df00 100644
--- a/src/stdlib/prelude.ts
+++ b/src/stdlib/prelude.ts
@@ -939,7 +939,7 @@ riff randomVaried(amount, varyEquave = false, scale = $$) {
 
 riff coalesced(tolerance = 3.5, action = 'simplest', preserveBoundary = false, scale = $$) {
   "Obtain a copy of the current/given scale where groups of intervals separated by \`tolerance\` are coalesced into one.\\
-  \`action\` is one of 'simplest', 'lowest', 'highest', 'avg', 'havg' or 'geoavg'.\\
+  \`action\` is one of 'simplest', 'wilson', 'lowest', 'highest', 'avg', 'havg' or 'geoavg'.\\
   If \`preserveBoundary\` is \`true\` intervals close to unison and the equave are not eliminated.";
   if (not scale) return [];
 
@@ -957,6 +957,9 @@ riff coalesced(tolerance = 3.5, action = 'simplest', preserveBoundary = false, s
         havg(...group);
       } else if (action === 'geoavg') {
         geoavg(...group);
+      } else if (action === 'wilson') {
+        sort(group, (a, b) => wilsonHeight(a) - wilsonHeight(b));
+        group[0];
       } else {
         sort(group, (a, b) => tenneyHeight(a) - tenneyHeight(b));
         group[0];
@@ -980,7 +983,7 @@ riff coalesced(tolerance = 3.5, action = 'simplest', preserveBoundary = false, s
 
 riff coalesce(tolerance = 3.5, action = 'simplest', preserveBoundary = false, scale = $$) {
   "Coalesce intervals in the current/given scale separated by \`tolerance\` (default 3.5 cents) into one. \\
-   \`action\` is one of 'simplest', 'lowest', 'highest', 'avg', 'havg' or 'geoavg' defaulting to 'simplest'.\\
+   \`action\` is one of 'simplest', 'wilson', 'lowest', 'highest', 'avg', 'havg' or 'geoavg' defaulting to 'simplest'.\\
    If \`preserveBoundary\` is \`true\` intervals close to unison and the equave are not eliminated.";
   $ = scale;
   scale = $[..];
diff --git a/src/stdlib/public.ts b/src/stdlib/public.ts
index b963d7b5..9d83635e 100644
--- a/src/stdlib/public.ts
+++ b/src/stdlib/public.ts
@@ -1,10 +1,14 @@
 /**
  * Exported builtins without vectorization complications.
  */
-import {Fraction, LOG_PRIMES} from 'xen-dev-utils';
+import {
+  Fraction,
+  tenneyHeight as xduTenney,
+  wilsonHeight as xduWilson,
+} from 'xen-dev-utils';
 import {Color, Interval, Val} from '../interval';
 import {type ExpressionVisitor} from '../parser/expression';
-import {NEGATIVE_ONE, TWO} from '../utils';
+import {FRACTION_PRIMES, NEGATIVE_ONE, TWO} from '../utils';
 import {SonicWeavePrimitive, SonicWeaveValue, upcastBool} from './runtime';
 import {TimeMonzo, TimeReal} from '../monzo';
 
@@ -213,14 +217,38 @@ export function tenneyHeight(
     return new Interval(TimeReal.fromValue(Infinity), 'linear');
   }
   const height =
-    Math.log(monzo.residual.n * monzo.residual.d) +
-    monzo.primeExponents.reduce(
-      (total, pe, i) => total + Math.abs(pe.valueOf()) * LOG_PRIMES[i],
-      0
-    );
+    xduTenney(monzo.residual) +
+    xduTenney(monzo.primeExponents.map(pe => pe.valueOf()));
   return new Interval(TimeReal.fromValue(height), 'linear');
 }
 
+/**
+ * Calculate the Wilson height of the interval. Sum of prime absolute factors with repetition.
+ * @param this {@link ExpressionVisitor} instance providing context for the height of absolute intervals.
+ * @param interval Interval to measure.
+ * @returns Relative linear interval representing the Wilson height.
+ */
+export function wilsonHeight(
+  this: ExpressionVisitor,
+  interval: Interval | boolean
+): Interval {
+  const monzo = relative.bind(this)(upcastBool(interval)).value;
+  if (monzo instanceof TimeReal) {
+    return new Interval(TimeReal.fromValue(Infinity), 'linear');
+  }
+  const resHeight = xduWilson(monzo.residual);
+  if (resHeight === Infinity) {
+    return new Interval(TimeReal.fromValue(Infinity), 'linear');
+  }
+  let result = new Fraction(resHeight);
+  const pe = monzo.primeExponents;
+  for (let i = 0; i < pe.length; ++i) {
+    result = result.add(pe[i].abs().mul(FRACTION_PRIMES[i]));
+  }
+
+  return new Interval(TimeMonzo.fromFraction(result), 'linear');
+}
+
 /**
  * Attach a tracking ID to the interval.
  * @param this {@link ExpressionVisitor} instance providing context for the next tracking ID.