— Two crowns — Same mass, different density — Vertical slider ✓ Slider works — Slider controls crowns — Slider direction correct ✓ Full slider range — Fall animation ✓ Water displacement — Rising water level — Splash effects ✓ Physics correct — Live mass value ✓ Live volume value ✓ Live density value ✓ Live displaced water — Gilded displaces more — Heureka animation ✓ No external deps — Light bg / dark text ✓ Self-contained HTML
Completely wrong demo — implements a generic single-sphere Archimedes buoyancy explorer instead of the required two-crown (pure gold vs. gilded) Hiero problem; no crowns, no fall animation, no splash, no rising water level, no Heureka moment, horizontal sliders only, and dark background violates the light-bg requirement.
Completely wrong demo — implements a generic single-sphere Archimedes buoyancy explorer instead of the required two-crown (pure gold vs. gilded) Hiero problem; no crowns, no fall animation, no splash, no rising water level, no Heureka moment, horizontal sliders only, and dark background violates the light-bg requirement.