The checker shadow illusion is an optical illusion published by Edward Adelson, professor of vision science at the Massachusetts Institute of Technology (MIT), in 1995.[1]
The image of a chequer-board has an object casting a partial shadow over the light and dark squares, in which the square labeled A appears to be a darker colour than the one marked B, although they are actually both the same shade of grey. The illusion demonstrates that the perceived lightness or darkness of an object is determined not only by its physical luminance but also by its context and surroundings, in this case with the visual system discounting the shadow.[1]
The visual system is not very good at being a physical light meter, but that is not its purpose. The important task is to break the image information down into meaningful components, and thereby perceive the nature of the objects in view. — Edward Adelson.[2]
We use cookies to optimise our website and our service. By clicking on “All cookies”, you consent to us using all cookies and plug-ins as described in our Cookie policy.
Functional cookies
Always active
The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network.
Preferences
The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user.
Statistics
The technical storage or access that is used exclusively for statistical purposes.The technical storage or access that is used exclusively for anonymous statistical purposes. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you.
Marketing
The technical storage or access is required to create user profiles to send advertising, or to track the user on a website or across several websites for similar marketing purposes.