“The richest relationships are often those that don’t fit neatly into the preconceived slots we have made for the archetypes we imagine would populate our lives—the friend, the lover, the parent, the sibling, the mentor, the muse. We meet people who belong to no single slot, who figure into multiple categories at different times and in different magnitudes. We then must either stretch ourselves to create new slots shaped after these singular relationships, enduring the growing pains of self-expansion, or petrify.”