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Learned from a strong example prompt (not reused verbatim — different subject, same technique): a stop-motion/hand-animated look wants irregular timing, but true unseeded randomness breaks HyperFrames' determinism guarantee (same seek must always render the same frame). The correct pattern is a PRNG seeded once at composition start, stepping elements between held positions rather than tweening continuously — distinct from rule 1's continuous ambient idle, which is a different tool for a different texture. Kept separate from "The grammar, measured" (rules 1-6, empirically videoed) since there's no rendered proof for rule 7 yet — the new section and example are illustrative, not claimed as verified. Co-Authored-By: Claude Opus <noreply@anthropic.com>