This collection of literary nonfiction essays is lead by the metaphor of cocladogenesis — a unique evolutionary relationship between two lineages that combines coevolution and cospeciation — to suggest that a similar relationship should exist between the subjective and the objective experience, art and science, and the chronicle and the narrative. It is not the singular extreme of either side that results in the advantageously beautiful products of cocladogenesis — it is the constant dialogue between the two factions.