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.
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References
1.
KennedyJ M, 1987“Lo, perception abhors not a contradiction” in The Perception of Illusory Contours Eds PetrySMeyerG H (New York: Springer) pp 253–261
2.
ParksT EHuiL, 1989“Pictorial depth and the Poggendorff illusion”Perception & Psychophysics46465–468
