This fascinating illusion has been traversing the Web lately, so I may as well pass it along as well --- deals with a spinning silhouette that can be perceived spinning either clockwise or counter-clockwise (reminiscent of a Necker Cube, but far more interesting). Took me a loooong time to see the counter-clockwise motion, though once seen, it was easier to repeat; still, the clockwise motion is more apparent for most people. Haven't yet seen a really good or thorough elucidation of the illusion yet, though it may well be out there somewhere. "Cognitive Daily" has also written it up recently.
Gotta go now; gettin' a little dizzy...
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