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  2. Shepard elephant - Wikipedia

    en.wikipedia.org/wiki/Shepard_elephant

    Stanford psychologist Roger Shepard (March 2019), who first published this paradox in 1990. 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".

  3. 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.

  4. 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.

  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. Illusion - Wikipedia

    en.wikipedia.org/wiki/Illusion

    Example of visual illusion: a real gecko hunts the pointer of a mouse, confused with a prey An optical illusion. Square A is exactly the same shade of grey as Square B. (See Checker shadow illusion.) A visual illusion or optical illusion is characterized by visually perceived images that are deceptive or misleading

  7. Chubb illusion - Wikipedia

    en.wikipedia.org/wiki/Chubb_illusion

    The Chubb illusion is similar to another visual illusion, the contrast effect.The contrast effect is an illusion in which the perceived brightness or luminance of an identical central visual target form on a larger uniform background varies to the test subject depending on the ratio of the central form's luminance to that of its background. [4]

  8. Quantum time reversal seemed impossible due to the Second Law of Thermodynamics, but scientists finally fit the classic square peg into the quantum round hole.

  9. Entoptic phenomenon - Wikipedia

    en.wikipedia.org/wiki/Entoptic_phenomenon

    Entoptic images have a physical basis in the image cast upon the retina. Hence, they are different from optical illusions, which are caused by the visual system and characterized by a visual percept that (loosely said) appears to differ from reality. Because entoptic images are caused by phenomena within the observer's own eye, they share one ...