The Illusory Power of Shadows
Source: Imgur
The best optical illusions are the most unbelievable ones, and this image falls into that category. Take a look at the squares labeled A and B. Would you say they are the same or different colors? They look entirely different, right? Square A seems much darker than B. However; the reality is that these two squares are the same shade of gray. This illusion shows the power of shadows; with the presence of the cylinder casting a shadow and changing the tones of the squares around B, our brains perceive this square as being much lighter than A.