✓ 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
Comprehensive SVG-based demo with correct physics (ρ_gold=19.32, ρ_fake=11.30, same 1000g mass), live data panels, splash particles, wave animation, and a polished Heureka sequence — but crown movement is a linear translate with no discrete fall animation, and the water-rise pixel scale uses an arbitrary amplification factor (×8) that breaks quantitative accuracy of displayed cm values.
12,179 output tokens · claude-opus-4-6 · end_turn
Comprehensive SVG-based demo with correct physics (ρ_gold=19.32, ρ_fake=11.30, same 1000g mass), live data panels, splash particles, wave animation, and a polished Heureka sequence — but crown movement is a linear translate with no discrete fall animation, and the water-rise pixel scale uses an arbitrary amplification factor (×8) that breaks quantitative accuracy of displayed cm values.