One prompt, 1h54m of autonomous Claude work: how the Anatomy skill builds a working mechanical watch from one line
lmoroney · x · 2026-10-12
The Anatomy skill's site lays out its core rule — "the object is the explanation": no boxes, arrows or floating labels; Claude must invent a real, well-made machine whose moving parts embody the concept.
Key details:
- The demo case, "how a mechanical watch keeps time", came from one line and took 1 hour 54 minutes of Claude working autonomously in a single pass; you can wind it, slow time to 1/20th and 1/100th, and lift the bridges to see the train with true ratios (fourth wheel: one turn per minute; centre wheel: one per hour);
- Each figure is built from dozens to hundreds of solid parts, and every number shown comes from the same model that moves them;
- The one idea that matters sits at the top of SKILL.md;
- The author documents the two ways a figure typically fails.
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