Photographic book by Takashi Homma of Roppongi Hills, the biggest urban redevelopment in postwar Japan. We divided the book into 6 chapters, resembling the six circles of the logo. Each chapter analyses the photography in a different way, creating links of the architecture with nature, time and space. Strata is taken from the main essay in the book by Horie Toshiyuki and refers both to the landscape and the different conceptual layers that go to make up a city.