The image shows the silhouette of a woman turning round and round
. (She seems to be naked, but I'd say it's safe for work.) The text says:
Which way is the woman turning? Clockwise or anticlockwise? After a while, you will be amazed to find that not everyone will agree about which way she is turning! Even more amazingly, some people find that when they ask her, in their mind, to "change", the woman in the image responds by changing direction!
I stared at the spinning woman for a while, but I could only see her turning clockwise. I kept asking her in my mind to change direction, but she wouldn't. Can other people actually see her turn anti-clockwise? Apparently so. One guy analyzed the image frame by frame
to find out how the illusion works. But I'm not seeing it.
In fact, I'm thinking it might be a joke designed to get people to stare at the image for hours, desperately trying to will the woman to change direction. But she never will. (Thanks, Nirmala)