I remember that pre-1990, PostScript seemed like a miracle. "Computer Shopper" of all things, used to have a PostScript Guru column with all kinds of interesting stuff. All the computer I had access to was an Atari ST with GFA Basic, so really only the math and ideas translated, but it really was like seeing the future. Path-clipping in particular was mind-blowing.

It's partly archived online, and weirder than I remember! https://www.tinaja.com/glair01.shtml