Abstract
Sou Fujimoto, one of the young architects leading the architectural discourse in Japan, defines his architecture as 'architecture of in-between' and 'weak architecture'. As motifs of architecture, he takes natural objects such as forest, cloud, mountain, which could be represented by the fractal geometry. In his projects, he intends to make the incomplete whole from the relationship of the parts, and pursues the ambiguousness and continuity of interior/exterior, transparency/opacity, floors, functions etc. As he mentioned, his projects are the attempts for overcoming the modern architecture as Mies van der Rohe and Le Corbusier. 'The cosmos from the chaos' of Prigogine and Stengers influenced to young Fujimoto's architectural thought. The fractal geometry and the complexity theory play important role in his projects and his thought as alternative of modern architecture. The fractal geometry explain the logic of the nature which the euclidean geometry could not explain. The purpose of this these is to investigate the characteristics of the fractal geometry in Fujimoto's projects.