SUB_TRAKT is an interactive installation by Anne Niemetz and Holger Förterer, developed in 2002.
A space inside or close to a building is observed by a camera from above. Movements of people inside the observed space create acoustic responses on a four-channel sound system that is installed above the space. Every object creates a sound structure that changes according to size, speed and distance of the objects to one another.
In a separate space, a continuative and more complex interpretation of the captured movements is performed. An image of a three-dimensional cuboid is projected that matches the space observed by the camera. Movements of people inside the observation space cut into the virtual matter of the cuboid and leave traces that slowly fill up again. The relation of positive, filled, and negative, empty, space is thus reversed in this time lapse sculpture.
The slowly evolving surround sound that accompanies the sculptural projection depends on the structure of the virtual matter. Relevant parameters for sound generation are the respective base areas of the elevations, the average height of the lanes as well as the volume's development over time.
The work was shown in Karlsruhe (2002), Santiago (2003) and Kortrijk (2006).
Project website: www.subtrakt.de