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.
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 if attention remains locked onto the wrong features.
