Photos: Spirals go from nature to the lab
The nautilus is a cephalopod, like the octopus and squid. Unlike some animals in this class, it has a hard outer shell, which is divided into chambers. As the nautilus grows in size, it periodically seals off the shell behind it and creates a new, larger chamber to live in. This ongoing process creates the familiar spiral structure that is visible when a nautilus shell is sliced in half.
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