It’s in Genesis, when God, concerned about the potential power of a unified human community, “confounds” the language shared among residents in the Tower of Babel, leaving them unable to communicate or understand each other. It’s in Plato’s Symposium, when Aristophanes explains that Zeus, who also feared the power of a united human species, split us in half. Before then, the story goes, every person had four arms, four legs, and a two-sided face, with integrated male and female qualities. Now each of us is an incomplete individual, condemned to feel alone unless we find the companion who makes us whole.