Peter Zumthor - Swiss sound box, a pavilion for the 2000 expo in Hanover. The temporary pavilion was designed with the expo’s theme of “sustainability” in mind. Over 3000 cubic meters of Swiss Larch and Fir were shipped to Germany, and stacked in a fashion similar to standard lumber-drying racks. Engineer Jürg Conzett was brought in to devise a cable tensioning system that allowed the structure to be assembled without the use of nails, screws, or other adhesives. The tension rods were periodically tightened throughout the course of the expo to maintain structural integrity as the wood dried. The project was then disassembled and shipped back to Switzerland in a post-tensioned state, increasing the value of the lumber. The porous design also played a crucial role in the programing of the space; unlike other pavilions which traditionally served as national portfolios, the soundbox was intended as place to relax, socialize, and explore. Over 500 musicians wandered through the projects labyrinthian layout during its 6 month existence, sometimes interacting through the walls, other times congregation for orchestral performances. Three different bar and food areas ensured visitors had a more private space to relax amongst the congested expo grounds. Photos (C) Roland Halbe.