Those Dream Machines are great.
Went to an exhibition a few weeks ago where they had the original. Unfortunately I had a mighty hangover, so after a few minutes I felt really nauseous.
They had other interesting and kind of similar installations aswell, such as La Monte Youngs "dream house"
«
Around 1962, La Monte formulated the concept of «Dream House» as a piece that would be played continuously, experienced as a living organism with a life of its own, and exist in time as a tradition to itself. […] Time is so important for experiencing and understanding this piece that the exhibition was specially designed to give visitors the chance to offer themselves for longer stretches of time to the environment, and, perhaps, during the time span to frequently return to their own existence. It follows the principle that musical atmosphere is a function of time. […], and can be essential to experiencing frequencies over longer time periods, in order to adjust one’s nervous system and vibrate with the frequencies of the environment.»