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visual illusion

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Any of a diverse and heterogeneous group of illusions in the visual domain, also called optical illusions, the most significant of which fall into the following inexact and overlapping categories: ambiguous figures, which are not strictly illusory but are generally included in discussions of visual illusions, see duck-rabbit, Mach illusion, Necker cube, reversible goblet, Schröder staircase, Scripture's blocks, young girl/old woman figure; associative illusions, see Baldwin illusion, chequer-shadow illusion, Craik-O'Brien effect, curvature illusion, Delboeuf illusion, Ebbinghaus illusion, Ehrenstein's brightness illusion, Ehrenstein's square illusion, filled-space illusion, filling-in illusion, Fraser spiral, Gelb effect, Helmholtz illusion, Hering illusion, Hermann grid, hollow squares illusion, horizontal-vertical illusion, irradiation illusion, Jastrow illusion, Kardos effect, Land effect, Margaret Thatcher illusion, Morinaga misalignment illusion, Müller-Lyer illusion, Münsterberg illusion, Orbison illusion, Ouchi illusion, pattern-induced flicker colour, Pinna-Brelstaff illusion, Poggendorff illusion, Ponzo illusion, Sander parallelogram, star illusion, teacup illusion, top hat illusion, twisted-cord illusion, Wundt illusion, Zanforlin illusion, Zöllner illusion; illusory contours, see Ehrenstein's brightness illusion, Kanizsa triangle, random-dot stereogram; impossible figures, see Freemish crate, impossible trident, Penrose triangle, staircase illusion; movement illusions, see apparent movement (alpha movement, beta movement, gamma movement, delta movement), autokinetic effect, Cheshire Cat effect, flash-lag effect, hollow-face illusion, kinetic depth effect, Lissajous figure, motion capture, oculogyral illusion, optimal movement, Ouchi illusion, partial movement, Pinna-Brelstaff illusion, phantom grating, phi movement, random-dot kinematogram, rotating head illusion, spiral aftereffect, Ternus phenomenon, vection, wagon wheel illusion, waterfall illusion, windmill illusion; perspective illusions, see Ames room, corridor illusion, hollow-face illusion, horizontal-vertical illusion, moon illusion, Ponzo illusion, teacup illusion, trapezoidal window, turning the tables illusion; space-time illusions, see kappa effect, tau effect; stereoscopic illusions, see anaglyph, Cheshire cat effect, floating-finger illusion, hole-in-the-hand illusion, hollow-face illusion, Lissajous figure, Pulfrich effect, random-dot kinematogram, random-dot stereogram; visual aftereffects, see Aubert effect, contingent aftereffect, figural aftereffect, McCollough effect, motion aftereffect, spiral aftereffect, successive contrast, tilt aftereffect, waterfall illusion. See also carpentered world, Honi phenomenon, naive realism, Pepper's ghost, trompe l'oeil, Vierordt's law. Compare auditory illusion, postural aftereffect, tactile illusion.

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