Cognitive illusions
Cognitive illusions are assumed to arise
by interaction with assumptions about the world, leading to "unconscious
inferences", an idea first suggested in the 19th century by Hermann Helmholtz.
Cognitive illusions are commonly divided into ambiguous illusions, distorting
illusions, paradox illusions, or fiction illusions.
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Ambiguous illusions are pictures or
objects that elicit a perceptual 'switch' between the alternative
interpretations. The Necker cube is a well known example; another instance is
the Rubin vase.
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Distorting illusions are
characterized by distortions of size, length, or curvature. A striking example
is the Café wall illusion. Another example is the famous Müller-Lyer illusion.
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Paradox illusions are generated by
objects that are paradoxical or impossible, such as the Penrose triangle or
impossible staircases seen, for example, in M. C. Escher's Ascending and
Descending and Waterfall. The triangle is an illusion dependent on a
cognitive misunderstanding that adjacent edges must join.
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Fictional illusions are defined as
the perception of objects that are genuinely not there to all but a single
observer, such as those induced by schizophrenia or a hallucinogen. These are
more properly called hallucinations.
Optical Illusion And Magic
Author: David Riewe
Perhaps, optical illusion and magic are no different from each other for both
share the same effects: they amaze and fascinate and deceive the human eye.
A suspecting audience will lose the chance of catching the trick if you are
perfectly endowed with sleight of hand skill and interest.
Your eyes can be deceived both by magician's hand dexterity and apparent
psychological persuasion (patter). The apparent patter of a magician combined
with quicksilver hand skill is a perfect match to a dubious crowd.
Practical Optical Illusions
Optical illusions can be carried out in front of a large or medium size audience
or can be performed using pictures especially if you have no immediate contact
with the person you are trying to communicate with.
Pictures that visibly change their color or physically modifies along the way to
keeping a long stare at them or by following simple rules or instruction helps
you baffle your friends and amaze them of your ingenuity.
Optical Illusion is Magic
Magic is based on optical illusion because it involves the use of deceitful
tricks that tends to help you perform the unnatural. Some of the most famous
illusionists of time like Harry Houdini perform magic using a technique called
Pepper's Ghost.
In Pepper's Ghost illusory technique, the use of glass fibers are perfectly
positioned to create a hologram figure of the object you are trying to hide.
Special effects and the use of black background are also critical to the
performance of technique.
In the late 1800s, Harry Houdini first performed his major magic trick in front
of a large audience by making an elephant disappear and making if appear again
according to his own willing.
Since then, a lot of his contemporaries began making use of this type of
strategy until it was patented in the late 1860.
Magic is a type of Illusion
You can hardly separate magic from optical illusion because the one is
characteristic of the other. Magic involves the use of tricks that involve the
quick hand and the use of colors and objects that seem to block the actual image
of the main subject.
Specific productions (magic types) are achieved which shadows the image of the
main object being given attention to.
For example, a glass of water that is apparently empty is actually lined with a
clear material while the inside is stuff with material which you may show to
your audience as a product of your magic (coins flowing from an empty bottle)
when taken out.
Article Source: http://www.articlesbase.com/art-and-entertainment-articles/optical-illusion-and-magic-14127.html
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