A laser pulse train whose spectrum is a picket fence of exactly evenly spaced lines, which turned an optical frequency into something you can count — the 2005 Nobel, and the reason an atomic clock can be read at all; the repetition rate and the carrier-envelope offset both ride 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.