The light and shade taken away: every diamond is the same gray.
Lighter or darker?
Logvinenko illusion
Look at a diamond in a dark row and one in a light row. Which is lighter?
Neither: every diamond is the very same gray, though those in the dark rows look much lighter.
Why? The picture looks like blocks in light and shadow. Your brain decides that diamonds in shadow must really be lighter than they look, and those in the light darker, and shows you that. Alexander Logvinenko drew the first, in 1999; this is our drawing.
Picture: Drawn by Science Playground, after Alexander Logvinenko · Wikipedia(opens in a new tab)