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.

This is WEIRD. I stare at it, it goes clockwise, if I focus my eyes around to the shadow or look at it from an angle/almost upside down, suddenly it's going anti-clockwise and the only way to see it clockwise is to look away for a few minutes. [/url]