Martin van der Linden, a Dutch-born architect, was hunting for discarded or recycled wood that could be used to redesign his firm's own offices near Tokyo, when Nanako Tsujimoto, a designer in his firm, heard that a 40-year-old house—ancient by Japanese standards—was being demolished in her neighborhood. Van der Linden and his colleagues rebuilt part of the house inside of their existing space, complete with a small window and a set of sliding doors. The house-within-a-house became a small library and conference room. Leftover wood was used to build two smaller structures that house workstations for the firm’s staff.