M.C. Escher’s, Relativity, in Lego. (via Laughing Squid)
If you like this one, you may want to check out Startbucks Relativity. It’s pretty good too.
Oh, and if you want to bring a little Escher goodness to your Mac, have a look at the LotsaEscher Screensaver. It’s pretty cool. It’s by the same guy who gave us the incredible LotsaWater screensaver.