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Grey Squares Illusion

So if I clip on the image and go to move it the A square is darker, now compare with the B square and it's lighter. I don't believe this is true. Put a white piece of paper over the squares between A & B and you will see they are different shades

Parodoxical Statements from Life

to be honest no

The Famous Hole in a Sphere

No the diameter is not 6 inches To have a discrete answer the problem must therefore be to evaluate the volume of the sphere else the answer would determined by the diameter of the cylindrical hole and ought to be asking for the remaining solid volume.