A tone that climbs forever without getting higher: octave-spaced partials under a fixed spectral envelope, each fading in at the bottom as another fades out at the top, so pitch chroma rises while pitch height stands still — the Penrose stair in sound, drawn as the spiral it is.
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.