(There's no video for Bouncing Black Square yet. Please contribute to MR and add a video now!)
Bouncing Black Square is an extremely simple 1.2KB app that only displays a big square that bounces on the edges of the screen. Not sure if it was meant to be used as a screensaver or as a demo. There is nothing else, no menu, no about screen, nothing. When you click the mouse, it exits. The author is unknown.
Bouncing_Black_Square.sit (1.16 KiB / 1.19 KB)
Bouncing Black Square / compressed w/ Stuffit
Mac OS 6.x
Emulating this? It should run fine under: Mini vMac