Is this structure built of round columns or square columns? The geometry here is impossible, yet this structure is real and three dimensional.

The classic Old Woman Vs Young Girl.

When you first look at this illusion, does there appear to be fuzz where the white lines intersect? There is nothing there! Now, take two sheets of paper and cover the entire grid except for four black boxes, and one intersection (helps if you do this in a corner of the grid). Now, where did the fuzz go?

Can you count the number of WHITE spots and BLACK spots? This is another version of the previous illusion.

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