Optical illusion: The checkerboard Adelson

Or how our experience and envirronement can change the color perception ...

The first illusion shows how the color we perceive depends on what's around.
In this image, boxes A and B have exactly the same color.
To check, simply print the image and fold the paper to compare the colors.

Two elements crééent illusion:

• On the one hand, the brain distinguishes the colors depending on the surrounding environment. Thus zone A appears darker because it is surrounded by clear tiles. In contrast, area B seems clearer because of the darker tiles around it
• On the other hand, our experience is also affected. Indeed, we know the checkered squares alternately set of a dark color and light. It therefore seems logical that the area belongs to the B series of clear tiles. Pourant through the shade, Zone B is darker than the tiles clear the brain "corrects" the nuance and thinning zone B