Our present idea of the labyrinth is the Borgesian structure of “forking paths,” the bewildering chaos of passages that lead in many directions but never directly to our desired goal. But there is also another kind, or paradigm, of labyrinths. Penelope Reed Doob, in her excellent discussion of physical and metaphorical labyrinths of classical antiquity and the Middle Ages (1990), distinguishes between two kinds of labyrinthine structure: the unicursal, where there is only one path, winding and turning, usually toward a center; and the multicursal, where the maze wanderer faces a series of critical choices, or bivia.