Swirl by swirl - spirals in nature

What makes the tiny snail shell so beautiful? Why does that shape occur in nature over and over again - in rushing rivers, in a flower bud, even inside your ear? With simplicity and grace, Krommes and Sidman not only reveal the many spirals in nature - from fiddleheads to elephant tusks, from crashing waves to spiralling galaxies - but also celebrate the beauty and usefulness of this fascinating shape.