THE Right Brain vs Left Brain test ... do you see the dancer turning clockwise or anti-clockwise?If clockwise, then you use more of the right side of the brain and vice versa.
Most of us would see the dancer turning anti-clockwise though you can try to focus and change the direction; see if you can do it.
Taken from here...plus go there for more information
For me she only moves clockwise. Advantage to being a Lefty I guess