The Right Brain vs Left Brain test ... do you see the dancer turning clockwise or counter-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 counter-clockwise though you can try to focus and change the direction; see if you can do it.
LEFT BRAIN FUNCTIONS
RIGHT BRAIN FUNCTIONS
So, we've all been watching the lady spin, and we are finding that she does spin both ways, and if you watch her long enough, you start to feel a little queasy.