Documentary devoted to the architectural and urban planning designs of Le Corbusier. The architect supports his in-depth reflection on the city and its necessary adaptation to modern life with plans, drawings and images, particularly Paris, whose revolutionary development dreamed of by Le Corbusier is exhibited here. Its first projects will remain at the stage of a model: the modernization plan for the city of Algiers. Some will be created by other architects: Ministry of Education in Rio de Janeiro, UN Palace in New York. From the post-war period in less than 10 years, Le Corbusier created large housing units in Marseille, Nantes, a chapel in Ronchamps, a factory in Saint-Dié, a town in Chandigarh in India. Through diagrams, the architect presents his theory of the "radiant city", the mathematical key modulor of his work as well as his project for reorganizing the countryside, industrial and urban cities into a grouping around a cooperative system.