Really neat deep dive into a seemingly simple process. It talks about L-Systems, which are cool fractals built from very simple rules. The guy that made a map of reddit also made an L-System visualizer:

https://anvaka.github.io/lsystem/

L-Systems are named after one of the co-authors of a book called The Algorithmic Beauty of Plants, which is a deep dive into basically the math of plants. Very much changed how I look at plants.