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Left Brain, Right Brain: Say the color, not the word.
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Illusory Motion: Focus on the dot in the center and move your head back and forth.
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Black or White: Count the black dots.
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Center Circles: Is the left center circle bigger? (Hint: No.)
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Elephant Legs: How many legs does this elephant have?
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Staring At The Black Dot: After a while, the haze around it will appear to shrink.
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Horizontal Lines: Are the horizontal lines parallel, or do they slope?