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  2. Shepard elephant - Wikipedia

    en.wikipedia.org/wiki/Shepard_elephant

    Shepard first published this optical paradox in his 1990 book Mind Sights (page 79) giving it the name "L'egs-istential Quandary". [2] It is the first entry in his chapter on "Figure-ground impossibilities". The pen-and-ink drawing is based on a dream Shepard had in 1974, and on the pencil sketch he made when he woke up. [2]

  3. Vanishing puzzle - Wikipedia

    en.wikipedia.org/wiki/Vanishing_puzzle

    Interactive SVG of The Disappearing Bicyclist – in the SVG file, move the pointer to rotate the disc. A vanishing puzzle is a mechanical optical illusion comprising multiple pieces which can be rearranged to show different versions of a picture depicting several objects, the number of which depending on the arrangement of the pieces.

  4. Checker shadow illusion - Wikipedia

    en.wikipedia.org/wiki/Checker_shadow_illusion

    The optical illusion is that the area labeled A appears to be a darker color than the area labeled B. However, within the context of the two-dimensional image, they are of identical brightness, i.e., they would be printed with identical mixtures of ink, or displayed on a screen with pixels of identical color. [1]

  5. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    The Hollow-Face illusion is an optical illusion in which the perception of a concave mask of a face appears as a normal convex face. Hybrid image: A Hybrid image is an optical illusion developed at MIT in which an image can be interpreted in one of two different ways depending on viewing distance. Illusory contours

  6. Geometrical-optical illusions - Wikipedia

    en.wikipedia.org/wiki/Geometrical-optical_illusions

    Ponzo illusion in a purely schematic form and, below, with perspective clues. However, almost all geometrical optical illusions have components that are at present not amenable to physiological explanations. [4] The subject, therefore, is a fertile field for propositions based in the disciplines of perception and cognition. [5]

  7. Zöllner illusion - Wikipedia

    en.wikipedia.org/wiki/Zöllner_illusion

    A version of the Zöllner illusion. The Zöllner illusion is an optical illusion named after its discoverer, German astrophysicist Johann Karl Friedrich Zöllner.In 1860, Zöllner sent his discovery in a letter to physicist and scholar Johann Christian Poggendorff, editor of Annalen der Physik und Chemie, who subsequently discovered the related Poggendorff illusion in Zöllner's original drawing.

  8. This train track optical illusion has derailed the entire ...

    www.aol.com/news/2016-04-08-this-train-track...

    In this illusion, two figures that are identical (i.e. the two train track segments) appears to be different sizes while lying perpendicular to each other on a flat surface -- the lower one ...

  9. Café wall illusion - Wikipedia

    en.wikipedia.org/wiki/Café_wall_illusion

    The café wall illusion (also known as the Münsterberg illusion or the kindergarten illusion) is a geometrical-optical illusion in which the parallel straight dividing lines between staggered rows with alternating dark and light rectangles (such as bricks or tiles) appear to be sloped, not parallel as they really are.

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