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40 STRUCTURE AS ARCHITECTURE▲ 3.35 Roof structure over main pool. ▲ 3.36 Eighteen Turns, Serpentine Gallery Pavilion 2001, London,England, Studio Libeskind Angular and planar surfaces.▲ 3.37 Interior ribbed surfaces. ▲ 3.38 Verbier Sports Centre, Switzerland, André Zufferey, 1984.Complex stepping roof form.form a post-and-beam structural system while the sheet cladding functionsas shear walls, providing bracing for lateral loads. The orientationof the exposed interior ribs emphasizes each panel’s non-orthogonalgeometry (Fig. 3.37). The exposed structure enhances the shape andsense of panel directionality and intensifies the chaotic qualities of theassemblage. If a stressed skin or solid panel construction had been usedits planar aesthetic would place this work into the category of synthesizedforms.The Verbier Sports Centre is the final example of consonant architecturaland structural forms. The multiple pitched-roof form suits its surroundings.Roof planes step down to follow the mountainside slope andrelate comfortably to the adjacent chalet pitched-roofs. Roof trussesrun parallel to the slope and are articulated on the exterior where theybear on exposed concrete buttresses (Fig. 3.38). The stepping roof