Nice. The fact that it can be described by a diagram that fits on a single screen and could be absorbed by a new hire in 20 minutes is neat.

I wonder if there are ways to design software such that we can get visualizations like this generated from the code "for free". It could definitely be really useful when diff'ing code, or even just for general communication in meetings etc...

Perhaps there are some academic/esoteric languages that do things along those lines?