Optical illusion of a female silhoutte

Enjoy. This link has one of the best optical illusions ever. Some people see it rotating clockwise, others see it rotating counter-clockwise. And a third group sees it initilally one direction, but can make it switch back and forth if they want to.

One of my neuroscientist friends suggest that that direction that one sees it may not be so much an indication of right-brain versus left-brain tendencies (as stated in the webpage), but rather cognitive flexibillity on whether or not you can see it go both directions.

Regardless of the interpretation it seems the mind picks up on multiple visual cues to determine the direction of rotation — perception of the body parts and the rotational movement.

It’s a perfect example of how the human mind “fills in” things that aren’t necessarily there.