Way back in the 80's / early 90's there was a computer called the Amiga. It was an great system some running a whopping 4mhz. Don't laugh cause it behaved way better than Windows at the time.
Plus no one else had the guru meditation error for what the windows world now calls the blue screen of death. Anyway there was a demo scene and this video is from an Amiga.

It's best to put this on full screen and in a dark room. If you don't like strobes this video isn't for you.

It looses it's effect just a little but it brought back some good memories.

The demo scene was big on the Amiga. Basically just programming groups showing their stuff. Think of them as music videos for computers but doesn't have to be music based always...