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Look closely at tile A and B. They seem to be different shades of gray. They are actually the same exact shade. Don't believe
it? Try opening up the image in Paint or another image editor and put the 2 tiles side by side.
Stare at the image below and slowly move your head toward and away from the screen.
Are these lines straight or crooked?
Stare at the image on the bottom and move your head forward while concentrating on the center dot.
Stare at the image on the bottom and move your head forward while concentrating on the center dot.
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