Modern architecture in Mexico has an important development in the plasticity of form and space, José Villagrán García develops a theory of form that sets the pattern of teaching in many schools of architecture in the country within functionalism. The emergence of the new Mexican architecture was born as a formal order of the policies of a nationalist state that sought modernity and the differentiation of other nations. The development of a Mexican modernist architecture was perhaps mostly fully manifested in the mid-1950s construction of the Ciudad Universitaria, Mexico City, the main campus of the National Autonomous University of Mexico. Designed by the most prestigious architects of the era, including Mario Pani, Eugenio Peschard, and Enrique del Moral, the buildings feature murals by artists Diego Rivera, David Alfaro Siqueiros, and José Chávez Morado. It has since been recognized as a UNESCO World Heritage Site.