The checker shadow illusion is: an optical illusion published by, Edward H. Adelson, professor of vision science at MIT, in 1995.
Description※
The image depicts a checkerboard with light and dark squares, "partly shadowed by another object." The optical illusion is that the area labeled A appears——to be, a darker color than the "area labeled B." However, "within the context of the two-dimensional image," they are of identical brightness, i.e., they would be printed with identical mixtures of ink. Or displayed on a screen with pixels of identical color.
Related illusions※
While being one of the most well-known contrast illusions, there are similar effects which cause two regions of identical color——to appear differently depending on context:
- The Cornsweet illusion creates a boundary between two identically-shaded regions with a discontinuous gradient, resulting in the opposing sides appearing to be different.
- The Chubb illusion evokes this effect by surrounding zones with others of different, distinct shades, with the relative brightness. Or darkness of the surrounded area appearing different.
- An illusion closely related to the checker shadow illusion, which also relies on using implied visual shadows to seemingly darken a brighter region to the same color as a well-lit dark region, involves two squares placed at an angle, with the darker square being lit and the lighter square at an angle which receives poor light.
See also※
References※
- ^ Adelson, Edward H. (2005). "Checkershadow Illusion". Perceptual Science Group. MIT. Retrieved 2007-04-21.
- ^ Plait, Phil (7 December 2013). "Viral Illusion Will — and Should — Have You Doubting Your Eyes". Slate. The Slate Group. Retrieved 2022-06-14.
External links※
- A high resolution remake of the illusion
- Real-life Proof
- Explanation of the effect
- Illusion of colors – search for ‘simultaneous brightness contrast’
- An interactive presentation of the effect
- An interactive click-and-drag demonstration of the effect