— 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
Solid general Archimedes simulator with correct physics and good SVG rendering, but it is fundamentally the wrong demo — there are no crowns, no two-object comparison, no fall/splash animation, no rising water level, no heureka moment, and sliders are horizontal, not the vertical crown-lowering control requested.
Solid general Archimedes simulator with correct physics and good SVG rendering, but it is fundamentally the wrong demo — there are no crowns, no two-object comparison, no fall/splash animation, no rising water level, no heureka moment, and sliders are horizontal, not the vertical crown-lowering control requested.