My first idea,

Stemming from my last essay assignment based upon interactive art, my idea is to create an interactive room/wall which response to the users interactions within the room. i.e movement towards the walls of the room the heart beat of the participant and even the galvanic skin response or any other types of inputs.

The 'feedback' from the room/wall or results of the interaction will be in the form of audio and visual IE light and sound. this will then in turn create a response from the participant and create a type of dialog between the user and the room/wall itself.

For example if the user moves closer to one wall/room the lights on that wall/room will become brighter or dimmer and the pitch or tempo of the sound will change. the physical changes within the room/wall although user defined will also have a slight randomness too them which could in theory encourage the user to experiment with different styles of interaction with the room/wall itself in order to create a response from the room/wall itself.