This chapter critiques the legacy of standardization of material practices, shifting from repetitive production toward increasing customization of spaces, systems, and experiences. Prototyping technologies, now commonplace as recursive methods in the design of small-scale objects and building, are investigated as the basis for harnessing complexity at the scale of the city. Control is understood neither as a constraining regime nor as standardization, but rather as an experimental mode of testing multiple urban futures. Architectural typology is not viewed as stable and fixed but open to transformation and repositioning. Promoting innovation and experimentation, this final chapter elaborates an argument for heterogeneous and high-quality architecture, which balances endurance and change, longevity and adaptability.