(There's no video for Bahaus yet. Please contribute to MR and add a video now!)
Bahaus is what looks like a demo. It draws rectangles of various sizes at random positions, alterning between B&W. Clicking exists. There doesn't seem to be anything else about it.
(2.58 KiB / 2.64 KB)
Bahaus v2.6 / compressed w/ Stuffit
Mac OS 6.x - Mac OS 9.2.2
Emulating this? It could probably run under: Mini vMac