Special shapes
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The following are special shapes: However, they are either impossible to construct using Euclidian geometry or they look very unusual.
- henagon (or monogon) - A polygon with one side and one vertex. Impossible to make.
- digon - A polygon with two sides and two vertices. Looks like a straight line (but impossible to do in two dimensions, since both sides overlap).
- Möbius strip - An object that has only one surface. Can be made by cutting a strip of paper, turning it at one end, and pasting it together.
- Klein bottle - Same as a Möbius strip, but in three dimensions. Looks like a bottle, that does not have inside or outside, but only one of them. The Klein bottle is to the Möbius strip what the pyramid is to the triangle.
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