I remember having a Spirograph as a kid and being obsessed with it. Its geometric patterns are hypnotic and gorgeous. I also love generative music composition. So bringing those two things together in a browser tab, I’m hooked. Musical Spirograph is a relatively simple concept. A set of points dash around the screen according to mathematical equations, generating hypotrochoids and epitrochoids. Those points pass through a series of concentric rings which trigger specific notes.

Honestly, that alone is fun enough, but you can customize it quite a bit. There are six different virtual rotors to pick from, you can have up to three arms drawing …

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