Looks like a wonder exhibit of Jose Clemente Orozco's work at a Mexico City museum.
http://latimesblogs.latimes.com/laplaza/2011/01/orozco-exhibit-mexico-muralist-1.html
Mural section entitled "La Trinchera" by Jose Clemente Orozco on one of the walls of the San Ildefonso College in the historic center of Mexico City.
A clip -
"The Mexican muralist Jose Clemente Orozco (1883-1949) is the subject of an immense and exhausting survey up now at a downtown Mexico City museum, the Antiguo Colegio de San Ildefonso. A total of 358 pieces fill more than a dozen exhibit halls, including previously unexhibited drawings of studies for some of Orozco's most famous murals.
"Jose Clemente Orozco: Pintura y Verdad" opened in September to coincide with last year's bicentennial celebrations. Its run has been extended through the end of February. The viewing experience requires hours. The show's setting is also significant.
Orozco painted some of his lesser-known but most politically charged fresco murals along the arched corridors of the colonial-era college, founded by Jesuits in 1588, just 60 years after the fall of the Aztecs. The frescoes depict snooty members of Mexico's elite and scenes of violent warfare from the country's revolution a century ago. In one mural, in the main stairwell, the Spanish conquistador Hernan Cortez is shown sitting nude alongside La Malinche, his Indian interpreter and mistress. A faceless mixed-race man lies in the shadows beneath them -- offering a less-than-ringing endorsement of the fruits of the conquest.
For Mexicans who know their history and the "great" artists of the 20th century, this is familiar stuff. But for visitors and foreigners, "Jose Clemente Orozco: Pintura y Verdad" offers a surprisingly straightforward introduction to the expressive range of a master who remains controversial to this day."
(end/clip - lots more in the article)
I've seen a bit of Orozco's work, but not enough.