[quote=“ClassicalTeacher, post:5, topic:37338”]
[/quote] You’ll have to do that yourself.
(I had to)
The way to do it is this: You can take a piece of paper and make two small holes on it, the distance between the two holes should be the same as the distance between square A and B, the holes should be small enough to allow you to see only the center of each square without the edges of the squares.
Place the paper over the A and B squares and look through the 2 separate holes and you will see that both squares have the exactly the same shade of grey color.
Only because the surrounding of each square has different colors does it give you the impression that square A and B are two different colors.