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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?

Wow that's so cool! Wish I could turn this into a screen saver.
same here, ill do some digging once i get home and report back if i find a way.

edit: couldn't wait until I got home so I found a solution for mac users. You can use this[0] package to load screensavers from urls.

[0] https://github.com/liquidx/webviewscreensaver

Lowkey looks like a Windows screen-saver. But very cool explanation of the visualization!
Just a detail on styling. The white text/ black background combination is kind of hard on the eye since it's too much contrast. I would use a lighter shade of black for the background. Something like #0f0f0f would work.
nicely done ... I wonder what the laptop battery draw difference would be if this had been written for WebGL rather than canvas ?