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Why did Mexico use mosaics on the exteriors of public buildings during the 20th century?

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Bird mosaic — mosaic Mosaic floor fragment from a synagogue or church, cut stone with mortar from Israel, late 5th–6th century ce; in the Jewish Museum, New York City.

During the 20th century, Mexico utilized mosaics on the exteriors of public buildings primarily as a durable and visually striking alternative to traditional mural painting. Following the success of the Mexican mural renaissance in the 1920s and 1930s, which sought to communicate historical and political themes to the public, the government recognized the potential of monumental art for education and public engagement.12

As architects and artists looked to decorate the large, unbroken surfaces of modern architecture, mosaic became a logical choice because it offered greater longevity than less durable mural techniques. These works often integrated art directly into the structure of the building, reflecting a broader movement to synthesize modern architecture with national identity and history.13

Prominent artists like Juan O’Gorman and Diego Rivera employed natural stone to create these massive, colorful designs. For example, O’Gorman’s iconic mosaic on the library of the National Autonomous University of Mexico uses native rocks to depict Mexican history and culture, paying homage to the polychrome surfaces of ancient Aztec and Mayan temples.145