In 2001, the Viennese sound artists sha & GTT were commissioned by the City of Vienna to develop a walk-in sound installation for Dornerplatz in Vienna's 17th district: 14 monumental sound columns, elliptically arranged, produced surprising spatial effects, depending on the direction in which one was walking: approached from one side, the space of the steles opened up optically, viewed from the other side, it seemed closed. When one got nearer to the steles one could hear individual radio stations from all over the world, while at the centre one could hear a mélange of sounds from all the radio stations, arranged by the artists. Local residents were able to participate as "temporary" artists in the acoustic events by making their own programme proposals. As far as the technical implementation was concerned, extremely flat, weatherproof loudspeakers were embedded in the steles, while relaying technology was installed in the control room.