Sighting-Down and the Poggendorff Illusion: A Mystery within a Mystery

Name: Work Video:
Duration: 3 min 30 s
Description: As reported before, sighting-down one of the diagonal lines on a typical Poggendorff pattern will reduce the illusion even if that situation is only pictorial. But here it is also argued that sighting-down itself requires further understanding.
Theodore E. Parks
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