When the mural planned for the Hotel de la Selva in Cuernavaca was moved to Mexico City and expanded, he assembled a team of national and international artists to work on the panels in his workshop in Cuernavaca. This project, his last major mural, is the largest mural ever painted, an integrated structure combining architecture, in which the building was designed as a mural, with mural painting and polychromed sculpture. Known as the Polyforum Siqueiros, the exterior consists of 12 panels of sculpture and painting while the walls and ceiling of the interior are covered with "The March of Humanity on Earth and Toward the Cosmos". Completed in 1971 after years of extension and delay, the mural broke from some previous stylistic mandates, if only by its complex message. Known for making art that was easily read by the public, especially the lower classes, Siqueiros' message in "The March" is more difficult to decipher, though it seems to fuse two visions of human progress, one international and one based in Mexican heritage. The mural's placement at a ritzy hotel and commission by its millionaire owner also seems to challenge Siqueiros' anti-capitalist ideology.