 On the other hand, there is the Architecture of Lively Variety (Structure and Infill) which was formulated for user participation in housing by John Habraken in 1961.Also, in the 1960s, many well-known utopian projects were based on the principle of "Structure and infill".An influential prototype of this direction is the Yamanashi Culture Chamber in Kofu by Kenzo Tange, completed in 1967.