IT'S the Great 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.
LEFT BRAIN FUNCTIONS | RIGHT BRAIN FUNCTIONS
uses logic | uses feeling
See the image in question here:
-Jon