Now can you please turn the other way?

A friend of mine posted this on the forums a few days ago, it turned out it's pretty popular and you might already know it but still.. Oh my this is amazing lol. If you are unsure of how it works, the lady you see in the animation can rotate clockwise or anticlockwise based on *who knows what*

Somebody claims it's linked to how our left and right side of the brain work, others say they can see it rotate one way or the other at will, others simply state that the pics don't hold enough "3D info", so it's a task for everyone's brain to make it turn one way or the other. I took a few screenshots and found out that each one can indeed show the lady in two different positions, hence the illusion. You turn.. What do YOU see?