Hexagon Spiral Tessellation
Mike Lawler tweeted about an upcoming family math he was doing with spiral tessellations. I had never played around with this hexagon spiral before. The angle requirements for when it tessellates are fun to figure out, and the bonus parallelogram structure (Spiral 2 Button) was one that was new to me, too.
Mike's tweet and picture: https://twitter.com/mikeandallie/status/675471915004334080