Kaleidoscope and later on Appearance Manager in Classic Mac OS were so much fun. No OS theming system I’ve encountered since have been as capable as those were.
Ye I wonder what fantastic APIs were actually exposed. I remember some 3rd party screen saver I had. Where like Goofy peeked out of folders and Donald Duck was cleaning up some file mess. I mean, how could you even program that?
I think it was on the real desktop, not some bitmap, but not too sure.
