Checker shadow illusion
The checker shadow illusion is an optical illusion published by Edward H. Adelson, Professor of Vision Science at MIT in 1995. The image depicts a checkerboard with light and dark squares. The optical illusion is that the area of the image labeled A appears to be a darker color than the area of the image labeled B. However, they are actually exactly the same color.
This can be proven using the following methods:
- Opening the illusion in an image editing program and using the eyedropper tool to verify that the colors are the same
- Isolating the squares. Without the surrounding context, the effect of the illusion is dispelled. This can be done by using the selection tool in some image editing programs.
- Using a photometer
- Connecting the squares with a rectangle of the same color, as seen below in the middle figure.
See also 
- Adelson, Edward H. (2005). "Checkershadow Illusion". Retrieved 2007-04-21.
- A high resolution remake of the illusion
- Real-life Proof
- Explanation of the effect
- Illusion of colours
- Video animation
- Alternative animation of the illusion
- An interactive presentation of the effect
- An interactive click-and-drag demonstration of the effect
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