🎃 Dancing Jack-o'-Lanterns: Beat, Gait and Candle-Shadow Theatre

A spooky-cute Halloween courtyard where a pumpkin-headed dancer follows your move cards. Set the tempo to find the arm-swing resonance (54.6 BPM, or 109 BPM with a half-time wave), watch the head lag on its neck spring and the balance margin, and slide a candle to grow the dancer's shadow on the wall with a computed penumbra.

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install