A rancher needs a new pen for his sheep. He asks an architect, and engineer, and a mathematician for help to build the biggest pen possible.

He leads them to a stack of fence pieces.

The architect takes all the pieces and makes a square, saying it's the most usual shape for such a structure.

The engineer takes all the pieces and makes a circle, saying it's the strongest shape you can make.

The mathematician walks confidently over to the stack, takes 3 pieces and makes a triangle. He stands inside and says, "I define myself as outside of the pen."

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