diff --git a/src/app/features/scene/creatures.test.ts b/src/app/features/scene/creatures.test.ts
index 8e59175b..011f19e3 100644
--- a/src/app/features/scene/creatures.test.ts
+++ b/src/app/features/scene/creatures.test.ts
@@ -10,14 +10,18 @@ describe('creature scale', () => {
     );
   });
 
-  it('is one fixed size for every neutral creature, whatever its sizeBucket', () => {
-    buckets.forEach((sizeBucket) =>
-      expect(creatureScale({ sizeBucket, neutral: true })).toBe(NEUTRAL_SCALE)
-    );
+  it('draws nothing for a neutral creature, whatever sizeBucket it was sent', () => {
+    expect(creatureScale({ neutral: true })).toBeNull();
+    buckets.forEach((sizeBucket) => expect(creatureScale({ sizeBucket, neutral: true })).toBeNull());
   });
 
-  it('is only visible as an override where the bucket would have said something else', () => {
-    expect(BUCKET_SCALE.small).not.toBe(NEUTRAL_SCALE);
-    expect(BUCKET_SCALE.large).not.toBe(NEUTRAL_SCALE);
+  it('does not crash or default to medium when a non-neutral creature has no sizeBucket', () => {
+    expect(creatureScale({ neutral: false })).toBeNull();
+    expect(creatureScale({ sizeBucket: undefined, neutral: false })).not.toBe(BUCKET_SCALE.medium);
+  });
+
+  it('draws nothing for an unknown bucket, including inherited property names', () => {
+    expect(creatureScale({ sizeBucket: 'huge' as SizeBucket, neutral: false })).toBeNull();
+    expect(creatureScale({ sizeBucket: 'toString' as SizeBucket, neutral: false })).toBeNull();
   });
 });
diff --git a/src/app/features/scene/creatures.ts b/src/app/features/scene/creatures.ts
index 5026d2e2..b67a423c 100644
--- a/src/app/features/scene/creatures.ts
+++ b/src/app/features/scene/creatures.ts
@@ -3,10 +3,12 @@
 // Props contract: heimdall-body:follow_up:ratatoskr-creature-projection-v2 (against GameCult/Bifrost; supersedes heimdall-body/ratatoskr-creature-projection).
 // Nothing here is binding until Bifrost's steward cuts that contract.
 //
-// Shape: {id, estate, sizeBucket, neutral, activity}.
+// Shape: {id, estate, neutral, activity} plus sizeBucket when neutral is false.
 // Invariants:
 //   - Exact vote weights stay in Bifrost; Ratatoskr only ever sees a bucket.
-//   - neutral=true overrides any bucket, and no size is drawn.
+//   - neutral=true means Bifrost publishes no sizeBucket, no kind and no energy. A received value is
+//     ignored, and a neutral creature is not drawn.
+//   - A missing or unknown sizeBucket is not drawn either; no size is ever defaulted.
 //   - activity comes from the Heimdall session.
 // Consent: humans get a coarse bucket by default plus a typed opt-out; Minds and Personas may show finer buckets.
 // Humans have three coarse buckets. The scales below (0.7 / 1 / 1.4) are placeholders, not fixed.
@@ -16,8 +18,8 @@ export type SizeBucket = 'small' | 'medium' | 'large';
 export interface Creature {
   id: string;
   estate: string;
-  sizeBucket: SizeBucket;
-  /** A neutral creature (no estate allegiance) is drawn at one fixed size whatever its bucket. */
+  /** Absent when neutral. Read it only through creatureScale. */
+  sizeBucket?: SizeBucket;
   neutral: boolean;
   activity: 'idle' | 'active';
 }
@@ -28,10 +30,8 @@ export const BUCKET_SCALE: Readonly<Record<SizeBucket, number>> = {
   large: 1.4,
 };
 
-/** Neutral creatures are medium sized, not necessarily their bucket's size. */
-export const NEUTRAL_SCALE = BUCKET_SCALE.medium;
-
-/** Neutral overrides sizeBucket. */
-export function creatureScale(c: Pick<Creature, 'sizeBucket' | 'neutral'>): number {
-  return c.neutral ? NEUTRAL_SCALE : BUCKET_SCALE[c.sizeBucket];
+/** The draw scale, or null when nothing is drawn: a neutral creature, or a bucket that is absent or unknown. */
+export function creatureScale(c: Pick<Creature, 'sizeBucket' | 'neutral'>): number | null {
+  if (c.neutral || c.sizeBucket === undefined) return null;
+  return Object.hasOwn(BUCKET_SCALE, c.sizeBucket) ? BUCKET_SCALE[c.sizeBucket] : null;
 }
diff --git a/src/app/features/scene/world.ts b/src/app/features/scene/world.ts
index ba9aec53..ba366a6e 100644
--- a/src/app/features/scene/world.ts
+++ b/src/app/features/scene/world.ts
@@ -24,7 +24,8 @@ export const WORLD = {
   erodeSide: [1.7, 0, 1] as const,
   erodeNorm: 0.5,
   // Bound on |grad| of the phasor's cos component for the side and norm above. Libby measured a
-  // sup of 6.63 at |side| = 1.5, n = 0 (CultLib PR #1 head 990521b3); 7.0 adds margin. The
+  // sup of 6.63 at |side| = 1.5, n = 0 (CultLib PR #1 head 990521b3); 7.0 adds margin.
+  // The sup was measured, not proved. The
   // shader passes roughness n = 0 as a literal, so the doc envelope max(10, 1.25|side|)/(1-n)
   // needs no 1/(1-n) factor here; if n ever becomes nonzero, divide this bound by (1 - n).
   // |value| <= 1 holds by construction (the output is a normalized phasor).