Astromony Picture of the Day has this illusion, hard to beleive, but it is true.
LINK Is A and B the same color? If you go to the link and click on the picture it is demonstrated. Something to think about next time you are trying to match a shade of paint of stain.
LINK Is A and B the same color? If you go to the link and click on the picture it is demonstrated. Something to think about next time you are trying to match a shade of paint of stain.

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