Harry Potter's marauder's map seem to be a good example of location-awareness device and a quite good metaphor of what I study (awareness of others' locations in space). Here is how it described by answers.com:

The Marauder's Map was created by Remus Lupin, Peter Pettigrew, Sirius Black, and James Potter as an aid in mischief-making. (...) At first glance, the map is simply a piece of blank parchment; but when the user says, "I solemnly swear that I am up to no good," ink lines stretch across it, revealing a map of Hogwarts (including secret passageways) and the location of everyone within the grounds. The map also gives information on how to open secret passageways. The words "Mischief managed!" return the map to its original blank state (to prevent someone who does not know the secret of the map from using it).