Source: WTL© photographs taken on-site at the UNAM library in Mexico, D.F. (2007).
Image: South façade of UNAM's Central Library. Here is a clearer view of the Colonial and Viceregal themes that O'Gorman depicts in the 400 years of Mexican history and humanities on the library's four sides.
Humanities questions: To what traditional beliefs does the number four refer in Mexican cultures?