“The specific path a life took was often decided in ways that were easy to discern, it was true, in the situation into which one was born, one’s race and gender and caste, in all the desires, aspirations, and narratives that one came thereafter to identify with, but people also carried deeper, more clandestine trajectories inside their bodies, their origins often unknown or accidental, their modes of operation invisible to the eye, trajectories which were sometimes strong enough to push people in certain directions despite everything that took place on the surface of their lives.”