Was just reading the masters thesis Drawing as Programming by Lingdong Huang and it has a "language of circles" that, like, by virtue of being made of nested circles, looks similar to your work @Ella Hoeppner. Might be an entertaining point of comparison.

Ooh, neat! Back when I made vlojure I assumed that other people must've done similar nested-circle visualizations before, since the idea is so simple, but never could find anything. This and the Circles of Evaluation thing that Beni posted are the closest I've seen, so it's good to know about them!