21_21 Design Sight is one of the more restrained additions to the ongoing redevelopment of Roppongi, a thoughtful contemporary transition between the monolithic shopping utopia of the Tokyo Midtown complex and the low-rise residential areas that surround it. Furthermore, whereas its seamless steel roof and concrete walls could have made for a cold and overbearing interior, its trapezoidal spaces manage to be both futuristic and intimate. Despite seventy percent of the building being located below ground level, a large lightwell lets in natural light. Exhibitions are ambitious, installationlike environments.