Why looking at skyscrapers can give you headache

In the natural world, patterns with high contrast and low contrast tend to cancel each other out, making the scene easier for the brain to process. However, urban architecture tends to feature regular, repetitive patterns such as railings, staircases and windows that are rarely found in nature. Because these repetitive patterns are harder to process and less comfortable to look at, they can trigger headaches and even epileptic seizures.