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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. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    Additionally the direction of motion can reverse due to the existence of multiple 3D visual solutions. Leaning tower illusion: The Leaning tower illusion is an optical illusion that presents two identical images of the Leaning Tower of Pisa side by side. Lilac chaser: Lilac chaser is a visual illusion, also known as the Pac-Man illusion.

  4. Magneto-optic effect - Wikipedia

    en.wikipedia.org/wiki/Magneto-optic_effect

    where () is the magneto-optical susceptibility (a scalar in isotropic media, but more generally a tensor). If this susceptibility itself depends upon the electric field, one can obtain a nonlinear optical effect of magneto-optical parametric generation (somewhat analogous to a Pockels effect whose strength is controlled by the applied magnetic ...

  5. Optical phenomenon - Wikipedia

    en.wikipedia.org/wiki/Optical_phenomenon

    Optical phenomena are any observable events that result from the interaction of light and matter. All optical phenomena coincide with quantum phenomena. [ 1 ] Common optical phenomena are often due to the interaction of light from the Sun or Moon with the atmosphere, clouds, water, dust, and other particulates.

  6. Extinction paradox - Wikipedia

    en.wikipedia.org/wiki/Extinction_paradox

    In the small wavelength limit, the total scattering cross-section of an impenetrable sphere is twice its geometrical cross-sectional area (which is the value obtained in classical mechanics).

  7. Optical illusion - Wikipedia

    en.wikipedia.org/wiki/Optical_illusion

    Other examples are the famous Müller-Lyer illusion and Ponzo 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 ...

  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. List of paradoxes - Wikipedia

    en.wikipedia.org/wiki/List_of_paradoxes

    Buttered cat paradox: Humorous example of a paradox from contradicting proverbs. Intentionally blank page: Many documents contain pages on which the text "This page intentionally left blank" is printed, thereby making the page not blank. Metabasis paradox: Conflicting definitions of what is the best kind of tragedy in Aristotle's Poetics.