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Triangle Tessellation with Gaps

We were working on Islamic tessellations in class, and Ashley Short came up with a nice one, that had several different structures. That was enough to get me experimenting with intentionally leaving a gap. So my first try has rotation points fixed at a third of the distance along the triangle (, and this one allows you to set the rotation point. So this could be a simple midpoint rotation tessellation of an equilateral triangle, or you can get funky.