Music Box Player
A sleep-sounds app, "Lullaby — Willow Waltz", built around an open walnut music box: a velvet lid with an oval mirror, a brass cylinder studded with pins, a steel comb of 18 teeth, a little governor fan and a crank on the front. Turn the crank and the cylinder turns with it: each pin that reaches the comb bends its tooth back and lets it ring with a warm glow at its tip, a note floats up past the mirror, and the playhead follows the song; the speed follows the crank.
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React Native · Expo SDK 52+, TypeScript
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