Mamikon's Pythagorean Proof
On Tumblr from-infinity-to-the-stars made the connection to my triangle wreath (http://mathhombre.tumblr.com/post/134158898784/triangle-wreath-regolo54-had-this-wonderful) that it was reminiscent of the Mnatsakanian Mamikon proof of the Pythagorean Theorem. New to me!
It is sweet and elegant, and itself reminiscent of one of my favorite problems. (http://www.geogebra.org/material/simple/id/224259)
Read more at Wolfram Demonstrations: http://demonstrations.wolfram.com/MamikonsProofOfThePythagoreanTheorem/