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  2. Penrose triangle - Wikipedia

    en.wikipedia.org/wiki/Penrose_triangle

    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.

  3. Optical illusion - Wikipedia

    en.wikipedia.org/wiki/Optical_illusion

    Paradox illusions (or impossible object illusions) are generated by objects that are paradoxical or impossible, such as the Penrose triangle or impossible staircase seen, for example, in M. C. Escher's Ascending and Descending and Waterfall. The triangle is an illusion dependent on a cognitive misunderstanding that adjacent edges must join.

  4. Shepard elephant - Wikipedia

    en.wikipedia.org/wiki/Shepard_elephant

    Blivet illusion, another impossible figure based on figure-ground confusion. The image is widely reproduced and discussed. Brad Honeycutt, author of Exceptional Eye Tricks, calls the Shepard elephant "one of the most famous and classic optical illusions."

  5. Penrose stairs - Wikipedia

    en.wikipedia.org/wiki/Penrose_stairs

    The Escherian Stairwell is a viral video based on the Penrose stairs illusion. The video, filmed at Rochester Institute of Technology by Michael Lacanilao, was edited to create a seemingly cyclic stairwell such that if someone walks in either direction, they will end up where they started. [ 12 ]

  6. 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.

  7. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    Impossible object: Irradiation illusion: Isometric illusion: An isometric illusion (also called an ambiguous figure or inside/outside illusion) is a type of optical illusion, specifically one due to multistable perception. Jastrow illusion: The Jastrow illusion is an optical illusion discovered by the American psychologist Joseph Jastrow in ...

  8. Hooper's paradox - Wikipedia

    en.wikipedia.org/wiki/Hooper's_paradox

    Hooper's paradox is a falsidical paradox based on an optical illusion. A geometric shape with an area of 32 units is dissected into four parts, which afterwards get assembled into a rectangle with an area of only 30 units.

  9. Necker cube - Wikipedia

    en.wikipedia.org/wiki/Necker_cube

    The Necker cube is an optical illusion that was first published as a rhomboid in 1832 by Swiss crystallographer Louis Albert Necker. [1] It is a simple wire-frame, two dimensional drawing of a cube with no visual cues as to its orientation, so it can be interpreted to have either the lower-left or the upper-right square as its front side.