The resulting menu item allows the viewer to watch an "oldskool demo" with a starfield, two DYCP scrollers (using the Amiga character set) and various other early demo effects such as blitter objects and metaballs (intentionally made to look low resolution), with chiptune music accompanying it.
Another example of a procedural surface is a Blob as illustrated in movies like The Abyss in the scene where the creature made up of water reaches out and touches the character.