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Sweet. Thanks for making this. It'd be awesome if you could extend the animation and show examples of complex shapes you could make with triangles.

It'd be even more awesome if you could actually make complex shapes with these triangles.

You can. It just requires absolute positioning. I can't see why you'd want to though, it's not hard enough to be fun or useful enough to be work.

And if you try this, you will usually get light segments in places where triangles forming some shape meet (due to antialiasing and overall hackery).