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!

it didn't work for me the first 1 1/2 minutes or so, then she changed from going clockwise to anti-clockwise.

and then i couldn't change it back to clockwise.

-_-

Look at her standing foot. Now say in your mind "left" and "right" as the foot turns. Now you can alternate directions as much as you want. the standing leg and foot is the key.

By staring at her upperlegs, right when the space between them closes- it is impossible to tell which direction she is going, so at that point you can change which direction you want her to go.

You were a little premature with your berating Corwin. You weren't the only one to ponder that the animation might be a looping gif. I tested this to see if it was a cycling gif as well. I watched it and counted out. The image never changed direction. It only changed direction if I looked away and then looked back. This wasn't time dependent. There is no rotation pattern except in Corwin's head. This kind of perceptual illusion is not anything new. Think of the Necker cube that seems to keep flipping it's perspective as you stare at it. http://en.wikipedia.org/wiki/Necker_cube

I can reverse it on screen if I try but my husband sees her spin one way then the other, a rhythmic cycle of back and forth, back and forth.

This site explains it, and you can add eyes to help see it turn.

http://www.michaelbach.de/ot/sze_silhouette/index.html

I can see it both ways. The trick is to tell yourself that when her leg goes behind the other one, it's actually going in front. You can get it to the point where it looks like she is swinging back and forth.

I would say hoax. When the image is turning clockwise, her right arm is bent. Then the image switches so that her left arm is bent and she is morning counterclockwise.

This illusion is an example of what is called the ambiguous motion effect, which is caused by an absence of depth cues. Your brain will attempt to make sense of this image by selecting a random direction that you will perceive the figure to be rotating in, although if you concentrate hard enough, you can change the perceived direction, or it can happen spontaneously. Most people probably perceive the image to be moving clockwise because of the position of her feet or arms, which make one direction look a little more natural than the other.

To me the key to making her change directions is watching the shadow of the uplifted foot. That shadow disappears as that foot moves "towards" you. So, as she rotates, if I watch for the shadow to appear on the right side of the screen, and then look up at her, she appears to be turning clockwise. If I watch for the shadow to disappear on the left side of the screen and then look up at her, she appears to turn counter-clockwise. My brain has adjusted to it well enough now that I can make her change direction EVERY time the shadow appears and disappears, therefore giving the illusion that she's not rotating at all, but switching direction back and forth while facing me.

I can't see her doing anything... is my brain broken? :-(

Watch her feet! When she's turning clockwise she's balancing on her left foot and when she's anti-clockwise then she's balancing on the right foot. The IQ being over 160 is BS.

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