2009
finalist

Another turn: a variant on the Shepard tabletop illusion

Lydia Maniatis

American University, USA
Another turn: a variant on the Shepard tabletop illusion

© 2009 Lydia Maniatis

The three pink- and blue-colored parallelograms are the same. All blue lines are equal in length; all pink lines are also equal. Box B is simply Box C rotated counterclockwise.
But the three parallelograms look different, and boxes B and C look different.
Our visual system assumes that the diagonals in A and C are foreshortened and “stretches” them perceptually. The pink lines in B should be foreshortened and stretched, just as they are in C. But our visual system doesn’t stretch a horizontal quite as much as it stretches a diagonal. Why not?

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| Presented Sunday, May 10th, 2009 |


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3 Responses to “Another turn: a variant on the Shepard tabletop illusion”

  1. Антон Павлович says:
    March 22, 2010 at 3:28 pm

    Our visual system assumes that the diagonals in […….

    Охотно принимаю. Вопрос интересен, я тоже приму участие в обсуждении. Я знаю, что вместе мы сможем прийти к правильному ответу….

  2. Kylie Batt says:
    April 20, 2010 at 11:06 pm

    Всё выше сказанное правда. Давайте обсудим этот вопрос. Здесь или в PM….

    Бармен официант Lydia Maniatis American University, USA © 2009 Lydia Maniatis The three pink- and blue-colored parallelograms are the same…..

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