A steel city that makes the neighbors talk. Japanese-style houses designed by their future buyers. A construction kit entrusted to students. In Brussels, Liège and Charleroi, three architects and a handful of utopian residents are going to make their housing ideals a reality. Just out of May 68, they want to demonstrate the revolutionary potential of industrialized architecture. A human and architectural adventure that has animated them for more than forty years... What remains today of their houses of tomorrow ?