marked in a way that resembles Xipe, which could correspond to a post-Olmec tradition, as similar figures were found in Tlaxcala. Mural work Painting and mural work was found on various levels of the main pyramid, on the Edificio Rojo, the La Conejera, the Pyramid of the Painted Skulls, the Altar of the Painted Skulls, the Stepped Pyramid, the Jaguar Altar, Edificio D and Edificio F. Studies of the various mural fragments found so far in the pre-Hispanic city of Cholula have reflected the political, economic and social changes over time. They also help to ascertain Cholula's relevance with the rest of Mesoamerica. There have been twenty one painted areas discovered by archaeologists, with eight mostly lost and thirteen still existing in situ. Most of the works belong to the Classic period, excepting those in the Edificio Rojo, which are from the Pre classic. The way that taluds, tableros and other surfaces were painted show changes over time in colors used as representations. The oldest have no representations, just the color red, but after 200 AD, there appear new colors such as different tones of red, as well as green, ochre, blue, black, and brown. Human like figures, animals and geometric shapes begin to appear as well. However, the Mural of the Drinkers is the only preserved mural that depicts human figures. So far, all of the discovered murals have been on outside walls, with the exception of an area called Edificio D (Building D), which has its murals inside. This indicates that most murals were created for the public and probably to teach and reinforce the religious and political symbols of the time. The best conserved murals have been found on the layers inside the main pyramid and in the Courtyard of the Altars, the two most important areas of the site. The Mural of Drinkers was discovered buried at a depth of almost and is one of the longest pre-Columbian murals found in Mexico, with a total length of . The building containing the Mural of the Drinkers was discovered accidentally in 1969 by Ponciano Salazar Ortegón while he was exploring Edificio 3-1-A. One of this building's taluds collapsed and exposed a portion of the mural behind it to view. Excavation of this building then continued until 1971. The building's main facade, which faces east towards the Courtyard of the Altars, contains the mural. This work also rescued