Remember the black/blue, white gold dress? Here's another one:

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GNTLGNT

The idiot is IN
Jun 15, 2007
87,651
358,754
62
Cambridge, Ohio
Okay, explain this to me. I don't get what they are saying.
....the wood that the train rails are laid on are known as "ties", I was making a punny......equal=tied......
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kingricefan

All-being, keeper of Space, Time & Dimension.
Jul 11, 2006
30,011
127,446
Spokane, WA
No, not that -- the actual optical illusion. Why are they the same size when on top of each other, but different when he moves it?
Because the person lays one end of it at the same point as the other one, therefore it makes it seem that one is larger. If they had laid it at the center point of the arc it would look the same size as the other piece.