Teater Insite uses directional sound in an innovative way:
The speaker is used during a monologue delivered by an actor hidden behind a curtain. At first you can place where the voice is coming from, but when we start sweeping the directed speaker over the audience (which is scattered in the room), the perception of her position becomes more diffuse, the voice floats around the room. You still know that she is probably there, but feel that she is “dissolving”, maybe she is not there anymore? Maybe she is a ghost?