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An amazing animated optical illusion in silhouette of a spinning dancer

See a link to a spinning dancer animation that could appear to be rotating clockwise by a person but could also be observed rotating counter-clockwise by another person looking at a same animation. Web sites as such listed the functions of left and right brain, and claimed that this is a personality test to tell if the observer uses more of his left or right brain by observing the rotating direction of the spinning dancer animation.