(There's no video for Zoomation yet. Please contribute to MR and add a video now!)
Zoomation animates zooming shapes (B&W and 16 colors mode supported) on a white screen. I could imagine back then people using this as a screensaver.
Zoomation.sit (8.98 KiB / 9.19 KB)
Zoomation v1.6 / compressed w/ Stuffit
Mac OS 1.x - Mac OS 9.2.2 (altough this will run TOO CRAZY FAST on anything after a 1980's Mac)
Emulating this? It should run fine under: Mini vMac