Central Library (UNAM) based on the mexica cosmogonical belief that the shape of the universe is composed of two joined ellipses. This one features Tlaloc glyphs related to tonalpohualli, the most important ritual calendar of the mexica people. Said calendar was the center of their celebrations and their astronomical calculations. The finishing stroke to this side of the mural is an image of the myth concerning the founding of the city of Mexico-Tenochtitlan. Central Library (UNAM) The Central Library of the National Autonomous University of Mexico (UNAM), is the main library in the Ciudad Universitaria Campus. It holds one of the largest collections
School of Sciences, UNAM four other buildings lodging the Faculty's respective departments and their faculty. The newer part of the complex consists of two buildings, one called "Amoxcalli", which holds the Faculty's library and the Computing Center. The newest one is called "Tlahuizcalpan" which hosts various labs and research premises, as well as classrooms. In recent years, an interdisciplinary extension of the Faculty was inaugurated in the port of Sisal, Yucatán, devoted to the research of coastal ecosystems and their species. The National Herbarium of Mexico at UNAM in Mexico City houses the largest collection of plant specimens in all of Latin America and