The Polyforum Cultural Siqueiros is a cultural, political and social facility located in Mexico City as part of the World Trade Center Mexico City. It was designed and decorated by David Alfaro Siqueiros in the 1960s and hosts the largest mural work in the world called La Marcha de la Humanidad. The building has a theatre, galleries and more, but the main focus is the Forum Universal, which contains the interior portion of Siqueiros' mural work. Visitors can experience the mural while standing on a rotating stage, listening to Siqueiros narrate. Site The Polyforum is a decagon shaped construction with different exhibition spaces that feature David Alfaro Siqueiros’ work. The building is part of a business complex called the World Trade Center Mexico City in the Benito Juárez borough of Mexico City. This complex was designed by architects Joaquín Alvarez, Guillermo Rossel de la Lama and Ramón Mikelajáuregui, and built just outside Parque de la Lama, but the Polyforum was designed and decorated by Siqueiros, who nicknamed it “El coronelazo.” The exterior is in the form of a diamond and the inside has eight sides. The building with its murals is considered to be an “artistic heritage site” for Mexico, registered by the Centro Nacional de Conservación, Instituto Nacional de Bellas Artes y Literatura and Registro del Patrimonio Artístico Mueble. The Polyforum is a multiple event facility dedicated to cultural, political and social events. Its main aspects include a 500-seat theatre, two galleries, offices and the Foro Universal or Universal Forum. The outside wall was built in 1970 as a way for patron Manuel Suárez to prevent encroachment or destruction of his property. The wall became immediately controversial because although it was built for safety purposes, it obstructed the view of the Polyforum for passersby, thus making it less accessible to the general public. The press allegedly deemed the wall defensive and antisocial, and Siqueiros tried to defend the wall by saying that it was merely an aesthetic extension of the Polyforum itself. Made into a work of art, the inner surface of the wall celebrates the fiftieth anniversary of the Mexican mural movement of which Siqueiros actively participated in with Diego Rivera, José Clemente Orozco, and others. The mural prominently features portraits of Rivera and Orozco, as well as Dr. Atl, a key figure in the start of the mural movement, and graphic artists Guadalupe Posada and Leopoldo Mendez.