Sunday, April 29, 2012

Definition of optical illusion

Optical illusions have been popular for hundreds of years and are a source of fascination for many. These illusions can take many forms, from making you see things that aren't really there, to seeing multiple things in a single image. They have been developed and used by psychologists and used by artists as far back as the 18th century.
Optical illusions could also be used or any other prop for the students to look at. A link to an optical illusion website is provided below.


Optical illusions could also be used or any other prop for the students to look at. A link to an optical illusion website is provided below.
 
Optical illusions were invented in 1890 by  Oscar Wilde , with the seminal " The Picture of Dorian Gray ". On first viewing, the picture is full of colour and contrast. However, upon closer inspection, it has no colour or shade at all; it was painted, as the title suggests, using only one colour of paint - " Dorian Gray ".


Optical Illusions and Visual Phenomena by Prof. Dr. Michael Bach, Department of Ophthalmology, University of Freiburg, Germany: <http://www.michaelbach.de/ot/>.  An extensive collection of visual / perceptual phenomena with explanations, including animations and applets.  Contributed by Joris Engelen of Bergen, Netherlands <enge@planet.nl>.
 
Optical illusions have been a part of our day-to-day experiences from times immemorial. Once people understood the science behind illusions, a lot of experimentation was done in the form of paintings and other visual arts. An overview of the history of optical illusions is presented through this article

Optical illusions are created when the Illumanati hack into your brain, and make you hallucinate. They make you go ?_?. It is a clever tactic, which no one has noticed, except me. The problem is, no one knows who these Illumanati members are because the Illumanatti does not exist and is in fact made up in yout mind, the real illusion.


There are many optical illusions and mirages that have made the entire world wonder about their perception and ability to distinguish what's real from what's false. There are famous head twisters known world-wide that people haven't yet explained and that still seem real today even if we know they aren't.


Artists who have worked with optical illusions include  M. C. Escher ,  Bridget Riley ,  Salvador Dalí ,  Giuseppe Arcimboldo ,  Marcel Duchamp ,  Oscar Reutersvärd ,  Victor Vasarely  and  Charles Allan Gilbert . Contemporary artists who have experimented with illusions include  Octavio Ocampo ,  Dick Termes ,  Shigeo Fukuda ,  Patrick Hughes ,  István Orosz ,  Rob Gonsalves ,  Gianni A. Sarcone ,  Ben Heine  and  Akiyoshi Kitaoka . Optical illusion is also used in film by the technique of  forced perspective .


There are two major types of optical illusions. Physiological illusions are often the result of overstimulation of the visual system. For example, if you stare for a long period of time at a brightly colored object, you might continue to see an "afterimage" of the object even after you look away. Cognitive illusions occur when you make unconscious cognitive assumptions about how things "ought" to be, sometimes making incorrect inferences about how things are in reality. For example, artist M. C. Escher created a famous lithograph print involving a staircase that appeared to both ascend and descend at the same time. The distance, depth, and edge cues used to perceive the direction of the stairs are incompatible, creating a perceptual contradiction.



Magic is the most common of all optical illusions. Simply put, having the choice to imagine what you see is truly happening is part of the illusion. Optical illusions come in all sizes and shapes and every magician who has performed before a live audience has created an optical illusion of some sort. Remember the days of an illusionist sawing women in half? As an adult that now seems somewhat silly. That such optical illusions as that are so believable seems to be the whole trick. I am certain a small child would still be taken in by the optical illusions of such a magical trick as a women vanishing from a closed up box on stage in front of many people.


One of the most interesting and amazing optical illusions is the St. Elmo's fire, in Edinburgh, Scotland. Also called ‘God's burning finger', this spectacular effect is known worldwide. Even if it's caused by the discharged electricity from clouds to earth, people still think it's the divine intervention the one that makes it so amazing. It can be seen on the masts of ships during serious storms and it represents the point where storms are ending. Also, it can be observed from the  Edinburgh Castle Rock , as this place is very high.


Optical illusion is an overwhelming tool that helps you to focus. When you can use optical illusions and successfully find solutions to solve the problems, thus you expend your awareness. Optical illusion uses objects verses parallel lines to make a point. Optical illusion has descended from Greece and stretched to our counselor offices today.