not fully adhere to Diego's guidelines. Consequently, the upper part of the building turned out to be somewhat heavy, rigid and not very flexible, compared to the original idea. Mosaics Both Rivera and O'Gorman carried out technical and aesthetic experiments for the decorative endings inside the Anahuacalli, using the cast mosaic technique, which consists of: "Place some cardboard with the drawn sketches directly on the wooden formwork. On these cardboards, with a glue emulsion, the pieces of stone were adhered following the image that the painter had created. Later, it was completed with the mortar stone to fix it. When all this dried up, the formwork and the cardboard were removed, and the image was corrected". The first attempts were not satisfactory, hence when a definitive solution was reached, the first slabs were demolished. Initially, the roof of the ground floor had skylights, which had to be sealed because the artist was unable to solve the passage of light without the use of vitroblock to give firmness to the floor of the next level. The complexity of the mosaics varies depending on the museum levels. While the designs of the ground floor mosaics are monochromatic, the mosaics on the upper sections were made with stones of different colors. In the windows, stones were placed in vertical cuts that simulated a fine rhythm that closed the large windows without horizontal lintels, but rather angular ones. The decision was to use a tecali stone in slabs as thin as they are translucent and thus achieve a tie with the stone. Outdoor spaces The total extension of the land of the Anahuacalli Museum is sixty thousand square meters, in which Diego Rivera designed the museum building and conceived a City of Arts; a space for artistic creation and feedback, where architecture, painting, dance, music, sculpture, theater, crafts and ecology coexist. In the center of the place, we find a large esplanade or central square, where various artistic events are frequently held. Located to one side of the main building is the Diego Rivera gallery, a space for high-quality temporary exhibitions. Another fundamental place in this enclosure is the Sapo-Rana art library, which houses the collection of 2400 copies from the personal library of the anthropologist Eulalia Guzmán, who donated them to the Anahuacalli Museum in the 1950s. This library also has valuable art books, available to be consulted in the room. In 2021,