This is my favorite [1]. These are a fun exercise to program yourself. Fairly straightforward but also insightful and easy to create fun variations with.
[1]: https://maximecb.github.io/Turing-Drawings/#2,10,0,2,1,0,6,1...
replies(2):
[1]: https://maximecb.github.io/Turing-Drawings/#2,10,0,2,1,0,6,1...