found: Zentrum Paul Klee, Bern, c2005:t.p. (Zentrum Paul Klee)
found: Zentrum Paul Klee, Bern : the architecture, c2006:p. 13 (the Zentrum Paul Klee is the fourth museum built by Renzo Piano) p. 25 (Piano constructed a building and created a landscape round it) p. 38 (the corridors are in fact bridges across the building's valleys)
found: Zentrum Paul Klee WWW site, June 14, 2006:home page (Zentrum Paul Klee, Bern) Landscape Sculpture page (on an "island" of green, the Zentrum Paul Klee rises in the form of three waves blending into the landscape, a harmonious landscape sculpture)