This is fun to see on HN, which has shown a (justifiable) affection for L-systems. I wonder if an example that is closer to the original root of L-systems (biological/botanical shapes, like trees) would be a nice addition the the initial basic examples?
you tend to get more tree looking structures if you crank up the rule complexity (https://ehrenjn.github.io/LSystems/lsystems.html?FADE_TIME_M...)
But if I had a way of raising the average number of square brackets per rule then it would probably end up generating a lot more trees.