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We haven't tried to make our tents truly circular or oval, because in fact they're going to be held in shape by finitely many guy lines and finitely many stakes; instead I think of each as a regular polygon with, perhaps, a rectangle stuck in the middle. For example, our first tent was a decagon (10 equal sides), with only one pole so there's no rectangle in the middle. Our second was a dodecagon (12 equal sides), split in half with a rectangle in the middle.