Sea shells

We picked up these shells on the beach at Eden. The conical one is the shell of an auger snail and the others are shells of sand snails. No one lives in these shells so they are mineral, essentially calcium carbonate.

The expanding spiral shape of these shells reflects the Fibonacci sequence of numbers, where each number in the sequence is the sum of the two preceding ones, so successive numbers get bigger and bigger, exponentially. This allows the shell to grow while maintaining the same shape. Other examples of the Fibonacci sequence in nature include the shapes of galaxies and fiddleheads of ferns. Isn't nature incredible - such diversity, yet many repeating patterns.

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