Optical illusions are based on the fact that sometimes our brains and our eyes can’t work together well enough to figure out what we’re actually seeing. Such is the case with the project shown in the video below. As soon as you see those little balls move, you realize the ‘rooftop’ doesn’t make any sense. I’m just going to tell you this: the secret is in the roof’s shape. But can you guess how the roof is actually shaped before it starts revolving? Don’t forget to share this video and challenge your friends to come up with their own answers: