Patterns in Our World

From The Smithsonian - 

The Science Behind Nature's Patterns

A new book explores the physical and chemical reasons behind incredible visual structures in the living and non-living world

A furled chameleon tail obviously takes its shape from the rolling of a tube,
but its pattern is distinct from that created by rolling an even tube,
such as that of a garden hose. The gentle taper of the tail produces
a logarithmic spiral—one that gets smaller,
yet the small parts look like the large parts. (Michal Filip Gmerek/Shutterstock.com)

The undulations of a sand dune reveal a pattern in time as well as space.
Sinuous waves arise from a pulse, an ebb and flow, as grains of sand
are blown in the wind. (Denis Burdin/Shutterstock.com)

Read more: http://www.smithsonianmag.com/science-nature/science-behind-natures-patterns-180959033/#HmG7CfIdXah4fwCG.99