Swiss Sound Box (Klangkörper Schweiz), Swiss Pavilion, Expo 2000, Hanover, Germany | Peter Zumthor: Taking the Expo theme of sustainability seriously, we constructed the pavilion out of 144 km of lumber with a cross-section of 20 x 10 cm, totalling 2,800 cubic metres of larch and Douglas pine from Swiss forests, assembled without glue, bolts or nails, only braced with steel cables, and with each beam being pressed down on the one below. After the closure of the Expo, the building was...