zhuzhiliao
Traditional toy that makes a wah-wah sound when it spins
...A fixed-step physics model simulates gravity, an elastic string, drag, tension, and rotational speed. Audio uses a real toy recording whose playback changes with motion, with a synthesized Web Audio fallback when the sample cannot be decoded. The mobile-first interface adapts to screen size, while a local counter records manual swings only in the browser. Its source is publicly visible, but the project explicitly restricts redistribution and public deployment.