The interior is also surfaced in Carrara marble. It divides into three sections: the main hall with adjoining smaller exhibition halls, the theatre and the offices of the Insituto Nacional de Bellas Artes. The main hall is covered by the Marotti glass and iron roof. It and the balconies of all three upper floors can be seen from the ground floor below. In areas of the main hall, pre-Hispanic motifs done in Art Deco style, such as serpents’ heads on window arches and Maya Chaac masks on the vertical light panels distinguish this interior from its contemporaries. The smaller exhibition halls are located on the first and second floors. The first floor is decorated with crystal lamps, created by Edgar Brandt and hold murals by Rufino Tamayo. The Adamo Boari and Manuel M. Ponce halls hold music and literature events. And the National and International halls are for exhibitions. The second floor has smaller exhibition halls as well as murals by José Clemente Orozco, David Alfaro Siqueiros, Diego Rivera, Jorge González Camarena, Roberto Montenegro and Manuel Rodríguez Lozano. The third floor is occupied by the Museum of Architecture. The ironwork was designed in Italy by Alessandro Mazzucotelli and in Mexico by Luis Romero Soto.