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Within visual perception, an optical illusion (also called a visual illusion) is an illusion caused by the visual system and characterized by a visual percept that arguably appears to differ from reality. Illusions come in a wide variety; their categorization is difficult because the underlying cause is often not clear but a classification proposed by Richard Gregory is useful as an orientation. According to that, there are three main classes: physical, physiological, and cognitive illusions, and in each class there are four kinds: Ambiguities, distortions, paradoxes, and fictions. A classical example for a physical distortion would be the apparent bending of a stick half immerged in water; an example for a physiological paradox is the motion aftereffect (where, despite movement, position remains unchanged). An example for a physiological fiction is an afterimage. Three typical cognitive distortions are the Ponzo, Poggendorff, and Müller-Lyer illusion. Physical illusions are caused by the physical environment, e.g. by the optical properties of water. Physiological illusions arise in the eye or the visual pathway, e.g. from the effects of excessive stimulation of a specific receptor type. Cognitive visual illusions are the result of unconscious inferences and are perhaps those most widely known.
Pathological visual illusions arise from pathological changes in the physiological visual perception mechanisms causing the aforementioned types of illusions; they are discussed e.g. under visual hallucinations.Explanation:
Answer: because it is the best thing to do and it is why people always choose it before any thing else because it leaves respect to other peo0le to give respect to you and others
David is a masterpiece of Renaissance sculpture, created in marble between 1501 and 1504 by the Italian artist Michelangelo. David is a 5.17-metre (17.0 ft) marble statue of the Biblical figure David, a favoured subject in the art of Florence.
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During the 1950s prior to independence, oil was discovered off the coast of Nigeria.
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you can use picsart or ibisPaintx there are other photoshop apps
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or you can it me up on insta, ill gladly do it (pixalpark)
