The palace has a mixture of a number of architectural styles; however, it is principally Art Nouveau and Art Deco. Art Nouveau dominates the exterior, which was done by Adamo Boari, and the inside is dominated by Art Deco, which was completed by Federico Mariscal. Since construction began in 1904, the theater (which opened in 1934) has sunk some four meters into the soft soil of Mexico City. The main facade, which faces Avenida Juárez, is made of white Italian Carrara marble. In the interior of the portal are sculptures by Italian Leonardo Bistolfi. It consists of "Harmony", surrounded by "Pain", "Rage", "Happiness", "Peace" and "Love". Another portion of the facade contains cherubs and sculptures representing music and inspiration. On the plaza front of the building, designed by Boari, there are four Pegasus sculptures which were made by Catalan Agustí Querol Subirats. These had been in the Zocalo before being brought here. The roof covering the center of the building is made of crystal designed by Hungarian Géza Maróti and depicts the muses with Apollo. One aspect of the Palace which has since disappeared is the "Pergola", which was located in the Alameda. It was constructed to house pictorial exhibitions for the 1910 celebrations, but it was demolished in 1973.