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Vista Paradox
The Vista paradox is a natural optical illusionJames T. Walker, Reta C. Rupich, Jack L. Powell, "The Vista paradox: A natural visual illusion", in ''Perception & Psychophysics'', 1989, 45 (1), p. 43 where an object seen through an aperture appears to shrink in apparent size as the observer approaches the aperture.Marco Costa, Leonardo Bonetti, "Linear Perspective and Framing in the Vista paradox", in ''Sage Journals'', Vol. 46, Issue 11 The paradox takes place when the distant object that seems to be shrinking or enlarging as its visual angle respectively increases or decreases is many times further away than the maximum distance between the observer and the aperture. See also * Depth perception * Forced perspective * Perceived visual angle * Perspective distortion (photography) In photography and cinematography, perspective distortion is a warping or transformation of an object and its surrounding area that differs significantly from what the object would look like with a nor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Two Towers, Bologna
The Two Towers (), both leaning, are symbols of Bologna, Italy, and the most prominent of the Towers of Bologna. They are located at the intersection of the roads that lead to the five gates of the old ring wall (''mura dei torresotti''). The taller one is called the ''Asinelli''. The smaller tower with a greater lean is called the ''Garisenda''. Their names derive from the families which are traditionally credited with having constructed the towers between 1109 and 1119. Their construction may have been a competition between the two families to show which was the more powerful family. The scarcity of documents from this early period makes this uncertain. The name of the Asinelli family, for example, is documented for the first time in 1185, almost 70 years after the presumed construction of the tower which is attributed to them. Asinelli Tower It is believed that the Asinelli Tower initially had a height of ca. and was raised later to the current , with an overhanging battl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Michele In Bosco
San Michele in Bosco is a religious complex in Bologna, central Italy, including the church with the same name and the annexed Olivetan monastery. The buildings of the monastery were acquired in 1955 by the municipality of Bologna, to house an orthopedic center named the Rizzoli Orthopedic Institute (''l'Istituto Ortopedico Rizzoli''). Religious center Located on a hill not far from the city's historical center, the area housed monastic structures as early as the 4th century AD. As was typical for shrines on remote sites or mountain tops, it was dedicated to the Archangel Michael. Tradition holds that the cenobitic community here was dispersed by the Goths in the early 5th century. After reforming, it was again destroyed by the Hungarian invasions of 906. Slowly recovering habitation, by 1107 it had begun to house Augustinian monks. Documents from 1120 and 1204 refer to this monastery. Between 1348 and 1359, the combination of plague and the occupation of the town by the Vi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bologna
Bologna ( , , ; ; ) is the capital and largest city of the Emilia-Romagna region in northern Italy. It is the List of cities in Italy, seventh most populous city in Italy, with about 400,000 inhabitants and 150 different nationalities. Its Metropolitan City of Bologna, metropolitan province is home to more than 1 million people. Bologna is most famous for being the home to the List of oldest universities in continuous operation, oldest university in continuous operation,Top Universities ''World University Rankings'' Retrieved 6 January 2010Hunt Janin: "The university in medieval life, 1179–1499", McFarland, 2008, , p. 55f.de Ridder-Symoens, Hilde [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Italy
Italy, officially the Italian Republic, is a country in Southern Europe, Southern and Western Europe, Western Europe. It consists of Italian Peninsula, a peninsula that extends into the Mediterranean Sea, with the Alps on its northern land border, as well as List of islands of Italy, nearly 800 islands, notably Sicily and Sardinia. Italy shares land borders with France to the west; Switzerland and Austria to the north; Slovenia to the east; and the two enclaves of Vatican City and San Marino. It is the List of European countries by area, tenth-largest country in Europe by area, covering , and the third-most populous member state of the European Union, with nearly 59 million inhabitants. Italy's capital and List of cities in Italy, largest city is Rome; other major cities include Milan, Naples, Turin, Palermo, Bologna, Florence, Genoa, and Venice. The history of Italy goes back to numerous List of ancient peoples of Italy, Italic peoples—notably including the ancient Romans, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optical Illusion
In visual perception, an optical illusion (also called a visual illusion) is an illusion caused by the visual system and characterized by a visual perception, 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 immersed 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 illusion, Ponzo, Poggendorff illusion, Poggendorff, and MÃ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Visual Angle
Visual angle is the angle a viewed object subtends at the eye, usually stated in degrees of arc. It also is called the object's angular size. The diagram on the right shows an observer's eye looking at a frontal extent (the vertical arrow) that has a linear size S, located in the distance D from point O. For present purposes, point O can represent the eye's nodal points at about the center of the lens, and also represent the center of the eye's entrance pupil that is only a few millimeters in front of the lens. The three lines from object endpoint A heading toward the eye indicate the bundle of light rays that pass through the cornea, pupil and lens to form an optical image of endpoint A on the retina at point a. The central line of the bundle represents the chief ray. The same holds for object point B and its retinal image at b. The visual angle V is the angle between the chief rays of A and B. Measuring and computing The visual angle V can be measured directly usin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Depth Perception
Depth perception is the ability to perceive distance to objects in the world using the visual system and visual perception. It is a major factor in perceiving the world in three dimensions. Depth sensation is the corresponding term for non-human animals, since although it is known that they can sense the distance of an object, it is not known whether they perceive it in the same way that humans do. Depth perception arises from a variety of depth cues. These are typically classified into binocular cues and monocular cues. Binocular cues are based on the receipt of sensory information in three dimensions from both eyes and monocular cues can be observed with just one eye. Binocular cues include retinal disparity, which exploits parallax and vergence. Stereopsis is made possible with binocular vision. Monocular cues include relative size (distant objects subtend smaller visual angles than near objects), texture gradient, occlusion, linear perspective, contrast differences, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forced Perspective
Forced perspective is a technique that employs optical illusion to make an object appear farther away, closer, larger or smaller than it actually is. It manipulates human visual perception through the use of scaled objects and the correlation between them and the vantage point of the spectator or camera. It has uses in photography, filmmaking and architecture. In filmmaking Forced perspective had been a feature of German silent films, and ''Citizen Kane'' revived the practice. Movies, especially B-movies in the 1950s and 1960s, were produced on limited budgets and often featured forced perspective shots. Forced perspective can be made more believable when environmental conditions obscure the difference in perspective. For example, the final scene of the famous movie ''Casablanca'' takes place at an airport in the middle of a storm, although the entire scene was shot in a studio. This was accomplished by using a painted backdrop of an aircraft, which was "serviced" by dwarfs stan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perceived Visual Angle
In human visual perception, the visual angle, denoted ''θ'', subtended by a viewed object sometimes looks larger or smaller than its actual value. One approach to this phenomenon posits a subjective correlate to the visual angle: the perceived visual angle or perceived angular size. An optical illusion where the physical and subjective angles differ is then called a visual angle illusion or angular size illusion. Angular size illusions are most obvious as relative angular size illusions, in which two objects that subtend the same visual angle appear to have different angular sizes; it is as if their equal-sized images on the retina were of different sizes. Angular size illusions are contrasted with linear size illusions, in which two objects that are the same physical size do not appear so. An angular size illusion may be accompanied by (or cause) a linear size illusion at the same time. The perceived visual angle paradigm begins with a rejection of the classical size–distance i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perspective Distortion (photography)
In photography and cinematography, perspective distortion is a warping or transformation of an object and its surrounding area that differs significantly from what the object would look like with a normal lens, normal focal length, due to the relative scale of nearby and distant features. Perspective distortion is determined by the relative distances at which the image is captured and viewed, and is due to the angle of view of the image (as captured) being either wider or narrower than the angle of view at which the image is viewed, hence the apparent relative distances differing from what is expected. Related to this concept is axial magnification – the perceived depth of objects at a given magnification. Perspective distortion takes two forms: ''extension distortion'' and ''compression distortion,'' also called ''wide-angle distortion'' and ''long-lens'' or ''telephoto distortion,'' when talking about images with the same field size. Extension or wide-angle distortion can be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Special Effects
Special effects (often abbreviated as F/X or simply FX) are illusions or visual tricks used in the theatre, film, television, video game, amusement park and simulator industries to simulate the fictional events in a story or virtual world. It is sometimes abbreviated as SFX, but this may also refer to ''sound effects''. Special effects are traditionally divided into the categories of mechanical effects and optical effects. With the emergence of digital filmmaking a distinction between special effects and visual effects has grown, with the latter referring to digital post-production and optical effects, while "special effects" refers to mechanical effects. Mechanical effects (also called practical or physical effects) are usually accomplished during the live-action shooting. This includes the use of mechanised props, scenery, scale models, animatronics, pyrotechnics and atmospheric effects: creating physical wind, rain, fog, snow, clouds, making a car appear to drive by i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optical Illusions
In 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 immersed 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 cau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
