Almost every weekend we walk over to our favorite cafe for breakfast. On Sunday I noticed this traffic light on our way home. We were walking on the opposite side of the street from this light, and as we approached the corner I looked up and the lights seemed to have a tall thin shape. I thought, how odd. As we walked through the intersection, I happened to look up again, and now they looked perfectly round. I realized it was just an optical illusion. As we reached the far side of the intersection I looked again, this time they looked short and fat.
I don’t recall ever noticing this on any other traffic light. You have to be standing dead-center for them to look round. If you’re off to either side, even a little, they totally change shape. That’s just weird.