A curve that visits every point of a square, which a curve should not be able to do — and whose locality is why databases and texture hardware both order two-dimensional data by it; the order steps with the level so the detail quadruples in jumps, as a recursion does.
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.