I'll quote wikipedia here: The demoscene is an international computer art subculture that specializes in producing demos: small, self-contained compute

I'll quote wikipedia here: The demoscene is an international computer art subculture that specializes in producing demos: small, self-contained computer programs that produce audio-visual presentations. The main goal of a demo is to show off programming, artistic, and musical skills. Basically, these programs are extremely small, but produce interesting and impressive visual or audio experiences. A popular example would be "fr-041: debris. by farbrausch": https://www.youtube.com/watch?v=mxfmxi-boyo https://www.youtube.com/watch?v=mxfmxi-boyo