Bright bars on a dark ground with a smudge at every crossing you are not looking at; the dots are never drawn, the viewer supplies them, and a drop swaps the plain grid for the scintillating variant.
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.