why a hidden figure can occasionally seem clearer in a thumbnail than in a large, detailed version of the same picture. Again, no new information has been introduced. The viewer has simply changed the scale at which the existing information is being processed.
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Another useful technique is to relax the gaze rather than concentrating intensely on one tiny area. People sometimes respond to a difficult visual puzzle by staring harder and harder at the place where they expect the answer to appear. That can become counterproductive
