Space mountain

Every time I go to use the urinal in the men's restroom, for some reason the corner of the ceiling at the edge of the fluorescent light catches my eye. I zone out on it while I am relieving myself. EVERY FREAKING TIME THIS HAPPENS! I can walk in there and tell myself, "I will not zone out on that spot." Yet, I will. Someone can be standing there, and I will do this. What is it about this one spot on the ceiling that has such a hypnotic effect on me?