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Right Brain vs. Left Brain Optical Illusion
Here’s a neat optical illusion. Look at the spinning dancer below. Is she spinning clockwise, or counter-clockwise?

If clockwise, then you use more of the right side of the brain, if counter-clockwise then you use more of the left side of your brain. I was able to get the girl to switch directions the first time I saw it, but, now I can only see her spinning clockwise. Can you get her to switch directions? It might take a few minutes, but keep trying.
Here’s what it all means– Apparently.
LEFT BRAIN FUNCTIONS
RIGHT BRAIN FUNCTIONS
[ source ]