State Of The Art - Spaceballs Amiga Demo
If you had a Commodore Amiga in the early nineties, its very likely you saw this and were impressed - how could one home computer with one floppy disk create this?
Over at Rhizome.org, there is an article about the Demoscene:
The demoscene is an international collective of programmers, graphics artists and musicians who create real-time audio-visual presentations with home computers. These people call themselves demosceners or just sceners. The real-time presentations are in turn called demos. Geographically the demoscene is a European phenomenon, with relatively little activity on other continents.
The Demoscene - an Overview