So you think you are experienced in color composition? OK, have a look at the following picture with black and white boxes:
Are the colors of squares A and B the same? No? Have a closer look.
Not convinced? Go back to the top image and see again. Nobody has changed the color of the squares. You have just witnessed an important phenomenon about how our brain functions.
The brain interprets the squares as they should appear: Black or white, shown here as dark and light gray. It completely disregards the fact that they have the same shade. The opposite squares suggest 2 different colors… and your brain accepts this as a fact.
It shows that often we observe things not as they are but as we want them to be.