This is a demonstration of how the exact same shade of gray will look
different depending on what color the background is. Another slightly
less apparant effect of this picture is that the big gray box in the
upper left looks darker than the bix gray box to the upper right, because
it is closer to the black square in the lower left. Use your hand to
cover up parts of this optical illusion experiment and you'll notice
how the shades of gray are affected!
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