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Types of Illusions

Checker Shadow Illusion (Contrast) Source: MIT
Checker Shadow Illusion (Contrast) Source: MIT

Adelson's Checker-Shadow Illusion Adelson’s Checkershadow Illusion Adelson’s Checkers Shadow illusion exploits the mechanisms underlying lightness constancy: our capacity to perceive the lightness (or reflectance) of a surface as invariant, even when the intensity of incident light (the illuminance) is changing at a point or is variable across the surface.

Chubb Illusion (Luminance) Source: Wikimedia
Chubb Illusion (Luminance) Source: Wikimedia

The Chubb illusion is similar to another visual illusion, ... the relative luminance of two target surfaces can be reduced, ... (Chubb illusions) ...

image: medium.com
Impossible Trident (Impossible Objects)
Impossible Trident (Impossible Objects)

It’s impossible for the Impossible Trident to exist because in order for it to exist rules of Euclidean geometry would have to be violated. For example, the trident appears at one end to have merely two prongs, but at the other end to have three, simultaneously.

Kanizsa's Triangle (Gestalt Effect)
Kanizsa's Triangle (Gestalt Effect)

This entry was posted in Cognitive Psychology, Fun Facts And Optical Illusions and tagged gestalt psychology, illusory contours, kanizsa triangle, law of closure, perception, reductionist vs holistic, visual illusion on May 1, 2012 by WIP.

Lilac Chaser (Color)
Lilac Chaser (Color)

The lilac chaser is a type of visual illusion that was first discovered by vision expert Jeremy Hinton in 2005. In order to view the illusion, start by clicking here to open the image in a new window.

image: youtube.com
Shepard's Tables (Size)
Shepard's Tables (Size)

This is an animation of Shepard’s Tables, an illusion first published by Roger Shepard as Turning the Tables, (see his wonderful book Mind Sights, 1990, pages 48 and 127-8). The left hand lozenge-shaped table top seems to get longer and thinner as it rotates, but it’s an illusion.

image: brainden.com
The Poggendorff Illusion (Geometric)
The Poggendorff Illusion (Geometric)

One of the most obstinately puzzling illusions is Poggendorff's, in which a slanting line interrupted by a gap no longer looks aligned. For over a century

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