geometrical optical illusions

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• Optical illusion — This article is about visual perception. For the Time Requiem album, see Optical Illusion (album). An optical illusion. The square A is exactly the same shade of gray as square B. See checker shadow illusion. An optical illusion (also called a… …   Wikipedia

• Café wall illusion — The café wall illusion The café wall illusion is a geometrical optical illusion in which the parallel straight dividing lines between staggered rows with alternating black and white bricks appear to be sloped. It was first described under the… …   Wikipedia

• Oblique effect — is the name given to the relative deficiency in perceptual performance for oblique contours as compared to the performance for horizontal or vertical contours. Contents 1 Background 2 The Phenomenon 3 Origin of the Oblique Effect …   Wikipedia

• Optics — For the book by Sir Isaac Newton, see Opticks. Optical redirects here. For the musical artist, see Optical (artist). Optics includes study of dispersion of light. Optics is the branch of …   Wikipedia

• number game — Introduction       any of various puzzles and games that involve aspects of mathematics.       Mathematical recreations comprise puzzles and games that vary from naive amusements to sophisticated problems, some of which have never been solved.… …   Universalium

• eye, human — ▪ anatomy Introduction  specialized sense organ capable of receiving visual images, which are then carried to the brain. Anatomy of the visual apparatus Structures auxiliary to the eye The orbit       The eye is protected from mechanical injury… …   Universalium

• Alhazen — For the Moon crater, see Alhazen (crater). For the asteroid, see 59239 Alhazen. Alhazen Alhazen (Ibn al Haytham) …   Wikipedia

• perception — perceptional, adj. /peuhr sep sheuhn/, n. 1. the act or faculty of apprehending by means of the senses or of the mind; cognition; understanding. 2. immediate or intuitive recognition or appreciation, as of moral, psychological, or aesthetic… …   Universalium

• Magic (illusion) — For other varieties of magic, see Magic (disambiguation). Illusionist redirects here. For the artistic tradition, see Illusionism (art). For other uses, see The Illusionist (disambiguation). Magic The Conjurer (painting), 1475 1480, by Hieronymus …   Wikipedia

• Hidden faces — People often see hidden faces in things. This is a kind of optical illusion. When an artist notices that two different things have a similar appearance, and draws or paints a picture making this similarity evident he makes images with double… …   Wikipedia

• Op art — Not to be confused with pop art or plop art. Movement in Squares, by Bridget Riley 1961 Op art, also known as optical art, is a style[1] of visual art that makes use of optical ill …   Wikipedia