While walking randomly, the guy behind http://www.walkingrandomly.com/?p=4203 discovered something interesting on the windows of an old building from The University of Manchester.
This mathematics themed stained glass window is part of The Sackville Street Building and it seems that other mathematical windows can be found in buildings from around the world, including Caius College, Cambridge.
So where is the failure ?
Nice pic from my old college, i use to stare at that window aimlessly during exams ! (it’s in what was the main building of UMIST, which merged back together with manchester uni a few years ago)