Coming about during postwar Japanese reconstruction, Gutai stressed freedom of expression with innovative materials and techniques. Gutai challenged imaginations to invent new notions of what art is with attention on the relationships between body, matter, time, and space. After the war, attitudes regarding cultural exchanging changed amongst nations as the art environment involved great optimism for global collaboration. Since artists were pursuing advances in contemporary art transnationally, the art environment of the time fostered thriving conditions for the Gutai group. For example, with the Treaty of San Francisco in 1951, there was an increase in cultural exchanges between Japan and its new western allies. Gutai artwork began being shown in exhibitions in both American and European cities.