SPINNING BALLERINA ILLUSION
Which way is the ballerina spinning… clockwise or counter-clockwise?
The silhouette image of the spinning dancer doesn’t have any depth cues. As a result, your eyes will sometimes see the dancer standing on her left leg and spinning to the right. And sometimes they will perceive her as standing on her right leg and spinning to the left. Most people, if they stare at the image long enough, will eventually see the ballerina turn both ways.