Coherer is a spatialized sound installation that facilitates exploration of the aspects of our environment that exist only as invisible signals. This installation consists of modified theremins that transform the exhibition space into a field of invisible electromagnetic activity. As participants enter this field of signals, their presence disrupts the electromagnetic environment, affecting the soundscape that surrounds them. Custom software mines data from local wireless networks, turning streams of live Internet activity into synthesized voices. These voices emerge and follow participants as they move through space. In the absence of viewers, drifting wireless signals sound like sparse cacophonous chatter within the room’s drifting drone.