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Template:POTD/2007-06-14

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Lilac chaser
A demonstration of the lilac chaser optical illusion, also known as the Pac-Man illusion. When one stares at the cross in the center of the image for 10–20 seconds, two effects will appear in order: One, the moving empty space between dots will appear as a green dot. Two, the moving green dot will appear to wipe out the purple dots, until only the green dot is visible. A separate effect appears if the eyes move away from the center, showing a ring of green dots.Image credit: Jeremy.Hinton