1. A system for selecting an object from a plurality of objects in a physical environment, the system comprising: a plurality of acoustic sensors; a sound analysis subsystem configured to analyze acoustic data received by the plurality of acoustic sensors, the sound analysis subsystem further configured to detect a snapping sound caused by a source controlled by a user of the system, determine the relative direction of the source of the snapping sound, and estimate the distance to the source of the snapping sound based on loudness measurements of the snapping sound detected in the acoustic data; an object distance estimation subsystem configured to estimate a distance to an object other than the source of the snapping sound based at least in part on the determined estimated distance to the source; and an object location subsystem configured to determine the location of the object relative to the system based at least in part on the determined relative direction, the estimated distance to the object and a location of the system.