Botanical Museum in Koshi
Situated on Mt. Godai in Japan, the museum consists of two tracts – an exhibition hall and a rectangular main building – linked by a corridor. The design sought to reflect the topography of the site and thus allow this complex to merge into the landscape. The broad roof slopes are articulated by a spine-like ridge construction. This and the free arrangement of the laminated timber trusses and rafters lend the internal spaces their organic form. Laid out to varying pitches, the rafters on the courtyard side are fixed to a tubular eaves purlin by means of individually adjustable, triangular steel elements. Where the exhibition areas open on to the courtyards, broad cantilevered roofs create a flowing transition between internal and external space.