World War II left a profound influence on the evolution of society, introducing significant changes in the fields of urban planning and architecture. During the 1930s, the Congrès Internationaux d'Architecture Moderne (CIAM) promoted modernism on an international scale. After the war, this architectural movement became firmly established as the dominant one, driven by the imperative of reconstruction and technological advancements. Influential figures like Le Corbusier and Alvar Aalto spearheaded this movement.
In 1959, the same year as the final CIAM meeting, Japanese architects like Kenzō Tange, Kishō Kurokawa —the designer of the Nakagin Capsule Tower—, and Kiyonori Kikutake began to explore new approaches to urban design and architecture, known as the Metabolist movement. This exploration was particularly significant in the context of Tokyo's rapid repopulation after the war and the scarcity of resources for reconstruction. Innovative concepts such as Marine City, The City in the Air, and the 1960 plan for Tokyo emerged, which proposed the city as a constantly evolving organism and emphasized the relationship between humans and their built environment. These ideas shaped the concept of "megacities" and reflected Japan's creative response to its challenging postwar situation.