


Simultaneous Contrast is when one color is placed on two separate colors that are placed next to each other. The one color then appears to be two separate colors due to brightness and contrast. This can also be done using shades.
After images are when someone stares at brightly colored objects for 30 seconds and then quickly switches to a white surface where the inverse of the original image is shown. This is caused by fatigue of the visual process. Therefore after images are best seen when eyes are well rested.
However these are just a few examples of optical illusions. Optical illusions can be caused by several different conditions, whether it be placement, color, shades, and the viewers specific eye.
http://www.colorcube.com/illusions/scstripe.htm
http://www.colorcube.com/illusions/optiart.htm http://www.visualillusion.net/Chap09/Page01.php
http://en.wikipedia.org/wiki/Optical_illusions
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