changed: - The Cavity Resonator is built to let people leave messages, shake their booty, compose in circles and Sing with The King. The Cavity Resonator is built with two pneumatically activated hip–swinging controllers, each equipped with an authentically rock–and–roll microphone and swept back roadster speakers, as well as a projection screen. The Cavity Resonator requires only compressed air, projection and a machine to run PureData upon. The Cavity Resonator is Open because The King is Open. The Cavity Resonator is a game, a composition tool, a social space and a hipswinging Karaoke machine for Elvis wannabes. The Sensory Circus, of which the Cavity Resonator is part, is an environment of localised body–based interactions installed in a temporary architecture. This architecture is a labyrinthine system composed to develop a spatial dramaturgy, bringing visitors from one part of the environment to the next in a spatialised “choose–your–own adventure.” A most important part of the Sensory Circus is the interaction of the public. Exposing them to an environment that operates unusually, the public is encourages to speculate proto–scientifically about their experiences, to share these speculations with others and to rediscover their own motion. The Cavity Resonator allows the visitors to act in space using their feet as a control mechanism. The space is a wire–frame environment consisting of walls, traces, Elvis icons and Karaoke bars. The visitor lays down audio traces by singing into the microphone. By navigating close to tracks, the visitor can hear what has been laid down previously. Thus a form of spatialised sampler is made available. By navigating into the Karaoke Bar spaces, the visitor can “Sing with the King” and recite favourite fragments of Elvis.