Flow Nature's patterns

Patterns are everywhere - in clouds, in an angelfish's stripes, or petals on a flower. But where does this order and regularity come from? Award-winning science writer Philip Ball's new series explores the science of how patterns arise in nature. In Flow, he explains the mechanisms at play that give rise to ripples on a beach, the curl of a wisp of smoke, or the swirling spiral pattern of galaxies far out in space.