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The old demo argued that a locked frame crops the story. The sharper claim is what a cut throws away: a move carries the spatial relationship between two shots, a cross-fade carries none. Five stages each get their own colour and the halves diverge on how the next colour arrives -- in place, or by travelling to it. 30-47% of pixels differ, against 3% for every version where the WITHOUT half moved the content. That 3% is the trap now documented in the rule: translating the scene and translating the camera are the same transform, so sliding content past a fixed frame is not a static comparison, it is the same shot rendered twice. Embed is cache-busted to -v2; docs images carry immutable year-long cache, so reusing the filename would serve returning visitors the old render. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>