Optical illusions by Akiyoshi Kitaoka
Illusions in the Encyclopedias & Dictionaries

Isn’t it interesting?

Rubber pencil
Zollner illusion
Cafe Wall
Parallel Lines visual illusion
Hermann grid illusions
Scintillating grid illusions
Kanizsa Triangle Illusion
Kanizsa Triangle Illusion-2
Kanizsa Triangle Illusion-3
Dynamic Luminance-Gradient Effect
Pinna - Brelstaff illusion
Morgan illusion
Pinna-Brelstaff-Spillmann illusion
The Mona Lisa illusion

Do not believe your eyes - Amazing things around us

this is the death mask of Horus?
Tower of Pisa
Leviant illusion
Leviant illusion
Leviant illusion
Leviant illusion
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Physiological visual illusions - mystery-play

Lev Tolstoy
Mona Lisa
Che Guevara

Optical illusions and delights from Akiyoshi KITAOKA

Высокоскоростные змеи
Теплый воздух
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3D-PICTURES by Julian Beever - On the sidewalk with chalk

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Did you know?
Illusions are distortions of sensory perception, "mocking" the senses so that most people are deceived

Optical illusions in the Dictionaries and Encyclopedias

  An optical illusion (also called a visual illusion) is an illusion caused by the visual system and characterized by visually perceived images that differ from objective reality. The information gathered by the eye is processed in the brain to give a percept that does not tally with a physical measurement of the stimulus source. There are three main types: literal optical illusions that create images that are different from the objects that make them, physiological illusions that are the effects of excessive stimulation of a specific type (brightness, colour, size, position, tilt, movement), and cognitive illusions, the result of unconscious inferences. Pathological visual illusions arise from a pathological exaggeration in physiological visual perception mechanisms causing the aforementioned types of illusions.
Optical illusions are often classified into categories including the physical and the cognitive or perceptual, and contrasted with optical hallucinations.
From Wikipedia, the free encyclopedia
  What is an Optical Illusion? Optical Illusions can use color, light and patterns to create images that can be deceptive or misleading to our brains. The information gathered by the eye is processed by the brain, creating a perception that in reality, does not match the true image. Perception refers to the interpretation of what we take in through our eyes. Optical illusions occur because our brain is trying to interpret what we see and make sense of the world around us. Optical illusions simply trick our brains into seeing things which may or may not be real.
Try out some of these illusions and discover just how tricky it can be for your brain to accurately interpret the images from your eyes.
  Definition of OPTICAL ILLUSION
Something that looks different from what it is : something that you seem to see but that is not really there.
The closer building looks larger than the farther one, but it's just an optical illusion. The two buildings are actually the same size.
Learner's Dictionary
  Definition of optical illusion in English:: optical illusion
Something that deceives the eye by appearing to be other than it is. An experience of seeming to see something which does not exist or is other than it appears.

Illusions are distortions of a sensory perception, revealing how the brain normally organizes and interprets sensory stimulation. Illusions can occur with each of the human senses, but visual illusions are the most well known and understood. The emphasis on visual illusions occurs because vision often dominates the other senses. Some illusions occur because of biological sensory structures within the human body or conditions outside of the body within one’s physical environment. Other illusions are based on general assumptions the brain makes during perception. These assumptions are made using organizational principles, such as an individual's depth perception and motion perception, and perceptual constancy that are part of our psychological ability.
Most illusions occur in people of all cultures and environmental experiences, indicating that they reflect universals in human perception. Research in illusions therefore seeks to understand how human beings perceive the environment through specific rules of perceptual construction.
llusions are also a source of fascination, commonly used by artists. In many cases two-dimensional art gains the appearance of the third dimension through the use of techniques based on principles revealed in illusions. One of the most notable uses of such principles is found in the trompe d'oeil technique. Other artists deliberately use illusion to entertain the observer by creating impossible figures. The continued development of such techniques, and the fascination they have for the viewer, reflect both the endless creativity and the appreciation for creativity that are to be found in human nature.

Understanding visual illusions
The study of illusions has focused on the visual system due to the prevalence and diversity of optical illusions. Our visual system faces a challenging task, attempting to correctly represent reality while calculating and perceiving various factors, such as light, color, texture, and size in a three-dimensional environment. Visual perception is created by our brain's interpretation of visual information and sometimes it results in fascinating visual illusions. Our mind gets "actively" involved in interpreting the perceptual input rather than passively recording the input, though it does not always accurately represent that input.
New World Encyclopedia

  Illusion - 1. A mistaken perception of reality. 2.Being deceived by a false perception or belief.
Optical illusion - 1. Of or relating to sight. 2.Relating to or using visible light
Environment - One’s physical surroundings.
Distortion - 1. A twists of fact or a misrepresentation. 2. A change in the shape of an image resulting from mistakes by our eye.
Psychologist - A person trained and educated to perform psychological research, like how the mind works and why people do the things they do.
Cornea - The transparent, convex, part of the eyeball that covers the iris and the pupil.
Transparent - Easily seen through; sheer.
Lens - A transparent, part of the eye that focuses light rays entering through the pupil to form an image on the retina.
Retina - The delicate light-sensitive part of the inner eyeball, connected to the optic nerve to the brain.
Iris - The color, round, colored part of the eye. It regulates the amount of light entering the eye.
Pupil - The black round opening in the center of the iris, through which light passes to the retina.
Optic Nerve - The nerve that goes from the retina, ling carry visual information to the brain.
Blind Spot - The small, round , region in the retina where of the optic nerve meets the eyeball. It has no rods or cones.
Traits - A important part, of a person's character.
Culture - The behavior, arts, beliefs, institutions, of a group of people
Afterimage - A visual image that stays even after the visual stimulus causing it is gone.
Background - The ground or scenery located behind something. 2. The part of a picture that appears as if it were in the distance.
Intersections - 1. A place where things intersect, especially a place where two or more roads cross. 3. Mathematics. The point where one line, surface, or solid crosses another.
Receptors - A special group of nerve endings that responds to sensory stimuli such as light.
Contrast - Two different objects. Red berries standing in contrast against the snow. 2. One thing that is different from to another. 3. The use of opposing colors, objects, or lines, next to each other to produce an strong effect in a work of art.
Camouflage - The blending in of one thing into its environment or natural surrounding. Disguise or protective coloring.
Altered - To change or make different
Superimposition - When two film clips are shown at the same time
Mirage - An optical effect that is sometimes seen at sea, in the desert, or over a hot pavement, that may have the appearance of a pool of water or a mirror in which distant objects are seen inverted. That is caused by the bending or reflection of rays of light by a layer of heated air of varying density.
Perspective - The representation of three-dimensional objects and depth relationships on a two-dimensional surface. 3. The appearance of objects in depth as see by normal vision.
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