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The checker shadow illusion is an optical illusion published by Edward H. Adelson, Professor of Vision Science at MIT in 1995. The image depicts a checkerboard with light and dark squares. The optical illusion is that the area of the image labeled A appears to be a darker color than the area of the image labeled B.

However, they are actually exactly the same color.

This can be proven using the following methods:

  • Opening the illusion in an image editing program and using the eyedropper tool to verify that the colors are the same
  • Isolating the squares. Without the surrounding context, the effect of the illusion is dispelled. This can be done by using the selection tool in some image editing programs.
  • Using a photometer
  • Connecting the squares with a rectangle of the same color, as seen below 

External LinksEdit

  1. http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html
  2. http://www.businessballs.com/shadow-optical-illusion.htm
  3. http://bsix12.com/checker-shadow-illusion/
  4. https://www.keyshot.com/explore-adelsons-checker-shadow-illusion-keyshot/2014/
  5. http://www.telegraph.co.uk/news/newstopics/howaboutthat/3520448/Optical-Illusions-the-top-20.html?image=6
  6. http://zigzorg.com/?p=102

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