Check out this picture and try to see which way does it spin clockwise or counterclockwise.

I see it clockwise most of the time, but after a while I could change directions if I concentrate I guess I'm more right brained.

Also you can look at the most bottom of the picture, the shadow of the leg repeats itself always in the same way no matter how you look at it.

So you can see the shadow and imagine the rest of the body spin they way you want it and change directions this way.

Here is the link:

http://www.jonlee.ca/clockwise-or-co...razy-illusion/