Organizing Programs Without Classes (1991) [pdf]

Related, and worth a watch: https://www.youtube.com/watch?v=Ox5P7QyL774

It's a video about the Self language, which I think was designed using the principles in this paper.

I like it because (like Oberon) it shows that programming and graphics can be much more closely interwoven than we're used to. They were doing it in the 90's. Then we lost it somewhere along the way by trying to make everything big and user-facing.