I just got it -- thanks for sharing this! Could watch it for hours...
If anyone else wants to download the screensaver, you can get it for linux/osx/ios/android: https://www.jwz.org/xscreensaver/ . Most in the collection aren't great (unless you're in an early-2000s aesthetic mood), but I just installed the substrate one :)
Ach! this reminds me of an artist who worked mostly with Processing ( https://processing.org ) and either did this or something very like it (and a bunch of other stuff.)