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Old 12-09-2013, 11:09 AM   #169
glatt
 
Join Date: Jul 2003
Location: Arlington, VA
Posts: 27,717
Look at the two tiles and ask yourself which one is the lighter tile.

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then hold your finger over the gap between the two, so the gap and all the shading and highlights next to it are covered, and look at the two tiles again, and ask yourself the same question.
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