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optical illusion | by billy liar
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optical illusion

I love this! The chess pieces in top row are exactly the same shade of grey as those in the bottom row. Only the background is changed.

 

Originally taken from this research paper:

Image segmentation and lightness perception. Anderson BL, Winawer J. Nature. 2005 Mar 3;434(7029):79-83.

 

Re-found when 'tidying' my laptop desktop.

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Uploaded on January 19, 2009