One such chambered shell is the nautilus shell, a common image in geometry used to symbolise the Fibonacci sequence, in which a number is the sum of the previous two (so 1, 1, 2, 3, 5, 8 and so ...

Shapes of this type are observable in nautilus shells, zebra stripes ... holds implications for both geometry and biology. For example, soft cells could shed light on a type of cell expansion ...