the story: I was in Sheffield a month ago for a day, a miserable day it was but I still managed to capture a few images around, mostly of the interesting buildings, modern architecture - only to be expected in a city like Sheffield with rich engineering history. These square things at an angle protruding out from the building are the windows. Also as I took this image from the ground level, not too far from the building, the asymmetry you see in it gives a nice optical illusion, although square, you might think the image wider on the top than on the bottom :)
Larger version HERE.
Larger version HERE.