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Red, Yellow, and Blue  

These three colors when mixed can produce other colors.

Primary Colors

Optical Illusion

The Lilac Chaser is a visual illusion that actually consists of multiple optical effects.  If you stare directly at the + in the center of the image, you will quickly notice that the purple discs will slowly disappear.  You should also notice that a single green disc rotating around in a circle will suddenly appear caused by an afterimage effect.

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