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Comment by Glen Etzkorn on May 5, 2016 at 14:46

by focusing on the various 2nd row square one can notice a difference in frequency of depth on the blue or green areas patterns less for raised green square, on the red square 2nd row the depth switch engages more areas but takes time as your eye overloads with energy. On the blue square is the fastest to denote a switch on adjacent red square and if your able to change gaze to the raised blue and hold concave depth longer. 

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