Cruising at Sixty to Seventy is the second book from award-winning poet Jim Tilley. In three sections—Dear Wife, Dear Self, Dear Friends—the speaker, a physicist and mathematician by education, now retired from a career on Wall Street, reflects on everyday experience, finding grace and drama in life’s smaller moments. As in Tilley’s debut collection, In Confidence, many poems use ideas, problems, and puzzles from physics and mathematics to explore personal relationships, such as “Particle and Wave,” in which a fundamental concept from quantum mechanics becomes a metaphor for the ripples and collisions on the fabric of family life. The book ends with a personal essay, “The Elegant Solution” (originally published as a Ploughshares Solo), about Tilley’s relationship with his father based on the language of mathematics.