Since its origins in the sixth-century, ikebana has been as much a philosophy as an art, with its roots in Zen Buddism and a reverence for nature. Over hundreds of years it has developed a complex set of unwritten rules, that take a lifetime to master. But in recent years the distinctive look of ikebana - with its love of the asymmetric shapes to be found in nature and its willingness to embrace simple, natural materials - has found a new audience...