This is a common illusion diagram, which has nothing to do with IQ. But it should be said that the producer's level is still quite high.

This rotation map I * * * has 34 frames, each frame is 0.03 seconds, which is less than the human visual retention time (0.05-0.2S). One period is1.02s, and the first 12 frame (0.36S) rotates clockwise, and the last 22 frames (0.66S) rotate counterclockwise. It's a secret. When the first few frames you come into contact with are the first 12 frames, then you see the dancers rotating clockwise. When the first few frames you touch are the last 22 frames, then what you see is the dancer rotating counterclockwise. Adjusting the attention can also control the direction of the dancer's rotation. For example, if you always see a dancer rotating counterclockwise, you can focus on the dancer's sole and shadow (this is the key part to judge the real rotation direction of this picture), and then your rotation direction will become clockwise. If you always look clockwise, please don't focus on your feet or cover the parts below your knees. If you watch it for a while, you should

Understand?