After the war, Le Corbusier concentrated on his art until 1922. After this, he began designing apartments that could be stacked on top of each other, to house people and meet their needs. This type of low-density housing was to deal with the problem of over-crowding in Paris. He said this transformation was needed, or a revolution could occur from the unhappy lower classes. He created a design for an ideal city (Ville Contemporaine) that was never built. It was a plan developed around a lot of skycrapers. He presented this plan to the French government, who refused it. This did raise their awareness of overcrowding in the city though.