Cosmos - - Gallery - CREDIT: CSPHOTO / GETTY IM­AGES

The shell of a nautilus fol­lows a shape known as a log­a­rith­mic spi­ral, com­posed of many cham­bers of the same shape but steadily in­creas­ing in size. The an­gle be­tween a tan­gent line and a ra­dial line stays con­stant as the shell grows, which is what makes the shapes con­sis­tent. When the nautilus out­grows its cur­rent cham­ber, it cre­ates a new and larger one to house it­self.

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