For the Expo 2025 Osaka Masterplan, jointly with Tohata Architects & Engineers and Azusa Sekkei, Sou Fujimoto (see more here) proposes a 60,000 sqm green roof structure made of timber. Spanning about 700 meters in diameter, the design reflects traditional Japanese timber construction and will serve as the venue’s main circulation ring, provide scenic vistas from above while protecting visitors from rain and sun exposure. ‘On the rooftop, visitors can go up and experience a lifted surface that resembles a bank, allowing them to appreciate the sky above and feel completely immersed in the environment. As the location is in the middle of Osaka Bay, no tall structures are around, offering a clear view of the sky in a pure circle,’ Fujimoto told designboom.