 Audition, unlike vision, lacks a spatial structure or field, claims Nudds. A purely auditory experience thus would not comprise a spatial field into which individuals independent from oneself might figure. Following an example from Martin (1992), Nudds argues that while vision involves awareness of unoccupied locations, audition does not involve awareness of regions of space as empty or unoccupied. Martin’s example is seeing the space in the center of a ring as empty. In audition, Nudds claims, one never experiences a space as empty or unoccupied.