Rhythm is life giving. We function according to days, weeks, months and years. We celebrate anniversaries and birthdays, dread tax time and look forward to time off. The cycles we go through help us move forward and stay in sync with the people around us. They increase both our productivity and our enjoyment of life, and they are essential to the health of our society. We see this truth throughout the natural world as well. Our calendars and timetables are based on seasons and phases, the perfectly predictable movement of our planet and moon through space. Rhythm is a form...