While the spring and roof designs are clear in their focus and outcome, a new strain in Endo's work, termed Growtecture, is more vague, and possibly richer in its lack of formal constraints. The first built example, an office building in the Chuou-ku area of Osaka, does not give any clear indication to its moniker, Growtecture S. A concrete and steel structure with an abundance of glass, the strongest parts of its design are first, the continuous wall/floor of concrete that snakes up and down and over the entire structure, evident on the facade, and second, the thin supports on the main facade that lean at different angles, except when they help to support the frames set within the mullion-free wall of glass. Growtecture S....Chuou-ku, Osaka, Japan