I argued with this one for a while, even when I clicked on the "to verify this click here" link. But if you cover everything except the 2 linked squares on that page it proves it to be true. Just goes to show that just because you saw something it does not mean it was really there.
APOD: 2009 October 4 - The Same Color Illusion
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APOD: 2009 October 4 - The Same Color Illusion
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