Autistic concert, by French artist Gilles Barbier, places the visitor into willing isolation. They have to put their head into suspended masks that diffuse electronic music. Go to the artist's page and click on the masks to hear the music.
Reminded me the KaskPam by Lydwine Van der Hulst, the Peekaboo chair and The Audiolab that Ronan and Erwan Bouroullec designed to allow people to hear sound-works in public spaces. In their installation, the sound falls like rain from a light roof that contains specifically designed speakers. The "fridge" on the side contains, both symbolically and practically, the machines that reassure us about the real source of the sound. Listeners aren't imprisoned under this rain. Their gaze slips away, distracting the eye and keeping the ear alert.