Right brain vs. Left brain
This is freaky: Do you see the dancer spinning clockwise or counter-clockwise? (It's a simple animated GIF so there are no parlor tricks involved!)
According to the Herald Sun, if you see her spinning clockwise, you use more of your right-brain than your left-brain, and vice-versa.
Left brain: uses logic, detail oriented, facts rule, etc. Right brain: uses feeling, "big picture" oriented, imagination rules, etc.
Try as I might, I only see her spinning clockwise. How about you?
Via @KuraFire on Twitter.