I've heard of crop circles before, but crop squares? Was the groundskeeper going for the Boston Garden look? With the gradation from dark to light borders it's like an Escher woodcut... except without the fish.
On another note, boy is it painful to see Chicago Fire icon Zach Thornton lumbering around out there. He still holds the career records for wins and saves for my beloved Fire. At his prime he was a brick wall in front of the goal. Now he looks and moves like a brick wall. Ugh.