2D optical illusions are dim-a-dozen. However, have you seen a moving 3D one before? Here’s one as seen on Maniac World.
Is the woman in the picture spinning in a clockwise or anti-clockwise direction?
very ugly ballet dancing
Whichever direction you see it spinning, try looking at the picture a bit longer – moving your eyes from the shadow to the black woman, and then back to the shadow again, continuously repeating the process.
After a short while… the direction will change! (At least it did for me)
Amazing hor? Anyone knows the trick behind this optical illusion?