The book focuses mainly on Lefebvre's urban studies and on "A critical theory of space", with a rigorous use of the works and the context in which they were produced. The entire historical-critical parable of its intellectual production is traced, analyzing the articulated theoretical constellation in which the historical method intersects with philosophical and sociological rigor. The intellectual heritage and the innovative gaze of the great French sociologist, among the protagonists of the "short century", are here presented in all their richness and complexity.