Every moment in our life happens only once, and if we let it slip away, we lose it forever--an idea captured by the Japanese phrase ichigo ichie. Often spoken in Japan when greeting someone or saying goodbye, to convey that the encounter is unique and special, it is a tenet of Zen Buddhism and is attributed to a sixteenth-century master of the Japanese tea ceremony, or 'ceremony of attention', whose intricate rituals compel us to focus on the present moment.