Mostly Likely to Really Be a Mii In Disguise:

(Photo Courtesy of Nina, Mii Creator courtesy of Joystiq)
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Powers of Ten
Optical Illusion
(The image above is an animated GIF)
To (supposedly) know what side of your brain is more dominant, just look at the moving picture. If you see her going clockwise, then you are using the creative side of your brain which is the right. If she moves counter-clockwise, then the logical part of your brain is working, which is the left side.
Myself, I can see it both ways, which is really trippy.

