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Color constancy and brightness constancy are responsible for the fact that a familiar object will appear the same color regardless of the amount of light or color of light reflecting from it. An illusion of color difference or luminosity difference can be created when the luminosity or color of the area surrounding an unfamiliar object is changed.
Colour constancy is an example of subjective constancy and a feature of the human color perception system which ensures that the perceived color of objects remains relatively constant under varying illumination conditions. A green apple for instance looks green to us at midday, when the main illumination is white sunlight, and also at sunset ...
Subjective constancy or perceptual constancy is the perception of an object or quality as constant even though our sensation of the object changes. [1] While the physical characteristics of an object may not change, in an attempt to deal with the external world, the human perceptual system has mechanisms that adjust to the stimulus.
For example, these can be in brightness or color, called intensive properties of targets, e.g. Mach bands. Or they can be in their location, size, orientation or depth, called extensive . When an illusion involves properties that fall within the purview of geometry it is geometrical–optical , a term given to it in the first scientific paper ...
The MIT Encyclopedia of the Cognitive Sciences explains the illusion as an effect of "size and shape constancy [which] subjectively expand[s] the near-far dimension along the line of sight." [ 4 ] It classifies Shepard tables as an example of a geometrical illusion , in the category of an "illusion of size."
Image credits: Roberto Serra - Iguana Press / Getty Images #3 Rembrandt (July 15, 1606 — October 4, 1669) Rembrandt is regarded among the greatest portrait painters and printmakers of all time.
Perhaps the most famous example of an illusory contour is the triangle configuration popularized by Gaetano Kanizsa. [2]Kanizsa figures trigger the percept of an illusory contour by aligning circles with wedge-shaped portions removed in the visual field such that the edges form a shape.
The list is full of examples of this art style and movement that were created by artists from all around the world. So, check them out; maybe it will convince you to become a surrealism enthusiast ...