Points on a circle joined to their multiples mod n, which draws a cardioid at two, a nephroid at three and a new epicycloid at every integer after — the whole family of caustics falling out of nothing but arithmetic; the multiplier rides the spectrum so the curve changes species with the music.
Drawn with: a WebGL2 shader.
Reacts to and looks like: gpu, webgl2 and audio-reactive.
Family: Visualiser.
Runs in your browser. The preview above is the same program the renderer uses.