For a smaller example, try the J Incunabulum[0] various explanations are available [1][2]

It's been discussed here before too.

[0] https://code.jsoftware.com/wiki/Essays/Incunabulum [1] https://blog.wilsonb.com/posts/2025-06-06-readable-code-is-u... [2] https://tony-zorman.com/posts/j-incunabulum.html