This optical illusion demonstrates how we see images three dimensionally.Anytime four New Yorkers get into a cab together without arguing, a bank robbery has just taken place. - Johnny Carson
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Is the black spot growing?

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This optical illusion demonstrates how we see images three dimensionally.

 

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Most people say that it does grow as you look at it.

Explanation

Here we're providing a simple perspective optical illusion showing how the rings, as they get closer and closer together, give us the sense of a 3D tube going deeper and deeper. We do not currently have a good explaination why the black grows.

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