Structure II. Photo courtesy of Jeff Purcell [January 4, 2003]
At the same time, the north side of the foundation of Structure II was remodeled by applying a new covering and adding two enormous masks [highlighted by the white rectangles] of more than four meters (13 ft.) in height on both sides of the central staircase. These huge masks, modeled in stucco, were decorated in red, black and blue.
Ramon Caqrrasco, Calakmul: The Archaeology of a "Superpower." The Stevenson Press, Inc.