“John has a theory that everyone is either a squid or an eel,” writes Elisa Gabbert in the final essay of Any Person Is the Only Self (FSG Originals). Baby squids are born entirely formed, “teeny versions of their later selves,” while eels, on the other hand, go through radical changes, and are hardly recognizable from their beginnings. “In part to test my squidness,” Gabbert takes up rereading the novels of her youth—Updike, Salinger, the works. Satisfyingly, most of them hold up—more or less.