The curved lines of a sailing ship resemble the inverted dome of a great cathedral, surrounded not by soot-covered buildings and crowded streets but by a vast liquid wilderness. This physical and symbolic connection is at the thematic heart of Cathedral of the World, a collection of essays in which writer and professional small-boat sailor Myron Arms sets out on a journey both physical and spiritual, seeking to explore what he calls "the primal spaces" and to articulate the sailor's age-old quest to understand his world and himself. Arms, author of the Boston Globe bestseller Riddle of the...