Turning Digits

 

Explanation

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If you made everything properly the image that has to appear instead of the question mark is the equation 8+1=9.

This type of illusions (and such devices) is famous enough and is based on the principle that your eye can keep an image for half a second after you have taken that image away.

 
Last Updated: August 8, 2007  |  Posted: April 18, 2001
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