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How does this illusion work?

  1. Jan 19, 2016 #1
    See:
     
  2. jcsd
  3. Jan 19, 2016 #2

    jedishrfu

    Staff: Mentor

    The suggestion is that the top box has the cards and the lower two boxes are empty. By first picking up three boxes, you are calibrating you mind to think that picking up one should be one third of the weight.
     
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