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  2. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.

  3. 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.

  4. Origami (magic trick) - Wikipedia

    en.wikipedia.org/wiki/Origami_(magic_trick)

    Origami is a magic stage illusion with a Japanese paperfolding theme, designed by Jim Steinmeyer. It was originally performed in 1986 by Canadian illusionist Doug Henning, using a working prop constructed by illusion builder John Gaughan. Illusionist David Copperfield later introduced presentational changes that would be widely copied by other ...

  5. Penrose triangle - Wikipedia

    en.wikipedia.org/wiki/Penrose_triangle

    The Penrose triangle, also known as the Penrose tribar, the impossible tribar, [1] or the impossible triangle, [2] is a triangular impossible object, an optical illusion consisting of an object which can be depicted in a perspective drawing. It cannot exist as a solid object in ordinary three-dimensional Euclidean space, although its surface ...

  6. Category:Optical illusions - Wikipedia

    en.wikipedia.org/wiki/Category:Optical_illusions

    The main article for this category is Optical illusion. See also: Category:Color appearance phenomena. Wikimedia Commons has media related to Optical illusions. An optical illusion is any illusion that deceives the human visual system into perceiving something that is not present or incorrectly perceiving what is present.

  7. Shepard elephant - Wikipedia

    en.wikipedia.org/wiki/Shepard_elephant

    Poster showing Shepard elephant (4 legs, 4 feet) The Shepard elephant, also known as L'egs-istential Quandary or the impossible elephant is an optical illusion, of the type impossible object, based on figure-ground confusion. As its creator Roger Shepard explains: [1]

  8. Optical illusion - Wikipedia

    en.wikipedia.org/wiki/Optical_illusion

    Optical illusion is also used in film by the technique of forced perspective. Op art is a style of art that uses optical illusions to create an impression of movement, or hidden images and patterns. Trompe-l'œil uses realistic imagery to create the optical illusion that depicted objects exist in three dimensions.

  9. Café wall illusion - Wikipedia

    en.wikipedia.org/wiki/Café_wall_illusion

    The same image, with colors of lower contrast, no longer displaying the 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 ...