Take a look at the picture below. The squares that the letter "A" and "B" are typed are the exact same shade of grey. If you don't believe me, print out the picture and cut out a square. This is buy far one of the coolest illusions I have seen.
The reason for this is that our mind sees the entire picture and wants to think square "B" is lighter than it is because of the alternating squares. (in case you are wondering, it could be a blue cube casting the shadow and the effect would be the same... a green cylinder is not mandatory. However the shadow itself is key.).
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