The Spinning Dancer Illusion

This drove me nuts this morning - Is she going left or is she going right?

Now, go grab a friend and ask him/her is the dancer is spinning clockwise or counter clockwise -

Crazy right?

Well, a japanese guy created this and... well, that says it all.

Have fun with it!

This below is a modified illustration to "help" you figure it out. uhm... yeah. 

http://en.wikipedia.org/wiki/The_Spinning_Dancer