One of the trickiest optical illusions in history.
This image was originally created by Edward H. Adelson, but was uploaded on Wikipedia by Adrian Pingstone. This featured picture is a phenomenon regarding optical illusions. If you take a close look at squares A and B, both are of the same color. I, myself, was fooled by this optical illusion, and if you look at the hexadecimal color, both are the same shade of grey (120, 120, 120) on the RGB scale.
