It's Robert Emms' birthday today. Happy birthday Rob! So, obviously, I felt this was a valid and legitimate excuse to make another Pythagoras wallpaper (like I need an excuse, really).
Thanks to the usual suspects (i.e. clea2011 and celeste9) for second opinions. Without their advice, I might have posted a slightly different version which was less tasty! :-)
Full size 1000 x 750 version here
Free for snagging, should anyone want it.