Looking at the Mapping Authorities’ building, I found a walkway/footbridge connecting two blocks. It is a shortcut for traffic between two different subsections of the Mapping Authorities. Here, the sound can be isolated, not bleeding into adjoining office areas, while the area still being actively used due to daily routine traffic. The footbridge has windows all along its length, making it attractive for the use of glass speakers. This kind of speaker transmits sound as vibration into the glass itself, making the glass surface the speaker. Sound is projected both on the inside and the outside, in a spatially diffuse manner (as the whole surface of a window now is the sound source). I wanted to use sound in different spatial positions to help differentiate and untangle the sometimes very dense data structures of VLBI, and at the same time the spatialization enhances the experience of envelopment of sound. The feeling of envelopment makes the sound act more as a natural source of the environment, as opposed to the sound of “a single speaker in a corner”, which obviously can be experienced as an artificial addendum.
For this installation I used a 12 channel glass speaker system, with speaker positions distributed over the length of the footbridge.