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.
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Miniature paintings are one of the many things that make an Indian proud of his country's rich cultural heritage. Miniature paintings originated long back in the history of India. Indian Paintings can be broadly classified as the murals and miniatures. Murals are huge works executed on the walls of solid structures, as in the Ajanta Caves and the Kailashnath temple. Flat or Dead-Flat Oil - Provides a completely flat, oil-based finish. Generally used on walls but not suitable for areas of high wear. THE COMPOSITION. Now go back to the subject and your first impressions about the painting. It's time to analyze how the artist made you feel the way you felt using the artistic means it his/her disposal. The composition is the position and the balance of the objects and figures in the space, the interrelation of their size, coloring, shading etc. How exactly does all that impact your perception? Let's dig in.
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Plaster. New dry plaster in good condition, which is to be finished with a paint other than water paint, should be given a coat of primer-sealer and allowed to dry thoroughly before being inspected for uniformity of appearance. Variations in gloss and color differences in the case of tinted primers indicate whether or not the whole surface has been completely sealed. If not, a second coat of primer-sealer should be applied. If only a few "suction spots" are apparent, a second coat over these areas may be sufficient. When you are including the finishing touches on a area with accessories, make sure that you remember this one important thing.. It is important to know which color is dominant. Do you desire for things to stay that way? Now highlight the main color with your accessories. Using accessories like paintings, throw pillows and baskets in bolder colors can help detract attention from other parts of the room. When you have all the tools at hand, examine your exterior. You might find exterior painting problems, which could be any of the following: alligatoring, blistering, chalking, chalk run down, crackling, dirt pickup, efflorescence, fading, frosting, lapping, mildew, nail head rusting, paint incompatibility, peeling, poor alkali resistance, poor adhesion, poor gloss retention, surfacent leaching, staining, vinyl siding wrap, wax bleed, or wrinkling. Ecological Paint. The "organic" paint brands, such as Ecos, which emerged in the late 1980s, heralded a new era of odourless paints, free of solvents and VOCs (volatile organic compounds) and paved the way for other companies' environmentally safe formulas. Following European legislation, the first stage in lowering the solvent content in paints and varnishes is set to come into force in 2007.