- John Golden
Saw a beautiful rug at http://islamandart.tumblr.com/post/47334157323. More info and an animated gif at http://mathhombre.tumblr.com/post/47378241170/saw-this-beautiful-rug-at-islam-and-art-and Like the tessellation in it, but I also loved the inferred motion. So I made the tessellation to animate. On edit you can change the shapes. Step 1 lets you see how they are put together, and Step 2 shows the full effect.
More GeoGebra at mathhombre.blogspot.com.