Poets and scientists alike are aware that our organism pulsates with the rhythms of its ancestry. Rhythm and pulsation are intrinsic to all life, from the beating of bacterial cilia to the alternating cycles of photosynthesis and respiration in plants, to the circadian rhythms of our own body and its biochemistry. These rhythms of the planet itself, the ebb and flow of the tides, the carbon, nitrogen, and oxygen cycles of the biosphere, the cycles of night and day, the seasons. Our very bodies are joined with the planet in a continual rhythmic exchange as matter and energy flow back and forth between our bodies and what we call “the environment”. Someone once calculated that, on average, every seven years all the atoms in our body have come and gone, replaced by others from outside us. This in itself is interesting to think about. What am I if little of the substance of my body is the same in any decade of my life?