Here is another space-filling curve generated by and L-system. I got the algorithm from: https://ja.wikipedia.org/wiki/L-system So far, I have learned about 3 different ways to create Sierpinski's Triangle: 2 different IFSs, generator iteration, multiple L-systems. The union of arcs in this version make it look especially intriguing.
I learned some more about L-systems through this page (in Japanese): https://ja.wikipedia.org/wiki/L-system