This illusion is called illusion of the same color.
On the chessboard of Adelson, boxes A and B are the same color.
The Grey Zone A is strictly identical to that of zone B.
To be convinced, just click the link below yellow cons, you'll see the boxes connected by the same color.
This illusion of the same color, clearly shows that our human senses can provide us with inaccurate results and give us a distorted picture of reality.
Especially in the case of a seemingly obvious color difference.
If you are suspicious about this illusion, you can check it with a photo editing software or simply by printing the image and juxtaposing the two areas, although they have the same color. This example highlights the propensity of the visual system to compensate for slow variations in brightness. Our brain interprets tints and colors in relation to their environment.
Similar illusions also occur in the sky, such as that relating to the apparent size of the moon when it is near the horizon, or some form of astronomical objects.
The advent of automated measuring devices such as electronic cameras have made science in general and astronomy in particular less prone to these phenomena, but not quite free from bias related to human perception.
Image: Called the Checker shadow illusion of Adelson, the Checker shadow is an optical illusion published by Ted Adelson in 1995.
On this board of Adelson, boxes A and B are the same color. This incredible illusion is verifiable here on this enlarged photo or with a photo editing software.
Credit: Edward H. Adelson, Wikipedia