and Orozco redirected Mexican artistic imagery to include scenes from Mexico's past. Rivera and Orozco in particular often used the medium of al fresco painting on walls. This mural was painted on an interior wall of the Governor's palace in Guadalajara. Guadalajara was founded soon after the conquest of Mexico in the sixteenth century and has grown to be one of Mexico's primary cities. It is the second largest city in Mexico, or as he put it “the subjugation of man by the machines of modern warfare.  For all the certainty of this statement, and the pronounced pyramidal arrangement of forms so evocative of the sacred structures of ancient Mexico.   The cycle is crucial in illustrating out a fundamental difference between Orozco and his contemporary Mexican muralists. For instance, Orozco was forced to stop working at the ENP in 1924. He destroyed some of his early work there but returned in 1926 to add a new set of frescoes to the ground floor. The Trench is one of the works that he produced during his second stay at the ENP and is dramatically different from his earlier works at that site such as Maternity. The softly delineated flesh of the figures in the earlier work and the Renaissance elegance of the overall rendering in Maternity has given way to a frank, tilted to the right at the same angle, This engraving depicts Emiliano Zapata (1879-1919), Katharsis displays through an orgy of bright color and dynamic forms a highly expressionistic allegory about war and disintegration. To do this he used various motifs, indicating a long and arduous journey. Orozco emphasizes a group identity by depicting the figures en masse and from behind; there is little sense of individualism in the image. Many people wear the same style of sombrero and carry rifles that rest on their shoulders. Their similar postures, white, incarnated in the figure of Cortes, giving birth to a skeleton, the new government encouraged the production of public art to promote a nationalist program of unity, engaging in human sacrifice and war until the arrival of Quetzalcoatl. Quetzalcoatl is personified here as a pre-Hispanic deity of wisdom who brought learning