Optical Illusions

This is an interesting picture I found while surfing the internet today. I like optical illusions and this must be one of the better ones I've ever seen. So with this picture the woman firstly appeared to me as if she was spinning clockwise.

To make her appear to spin the other way, focus on her shadow at the bottom and then eventually your eyes should adjust and see her moving in the opposite direction, for me that was now anti-clockwise.

Another way to make her change direction if your really desperate is to just imagine her spinning the other way with your eyes closed and then open them!