Another reason why the teapot is a useful object: The teapot is a torus, meaning it has a continuous surface. The inside surface of the teapot continues over the opening of the spout and top into the outside surface. Is basically a weirdly shaped donut. <br>Related fact: Due to how humans have a continuous opening, stretching from the mouth to the anus through the intestines, we too are weirdly shaped donuts!,(reply>), Well, you forgot about the nose holes. We aren't donuts, unfortunately.