Paleolithic body paint and perhaps in ritual. Undisputed evidence of art only becomes common in the Upper Paleolithic. Lower Paleolithic Acheulean tool users, according to Robert G. Bednarik, began to engage in symbolic behavior such as art around 850,000 BP. They decorated themselves with beads and collected exotic stones for aesthetic, rather than utilitarian qualities. According to him, traces of the pigment ochre from late Lower Paleolithic Acheulean archaeological sites suggests that Acheulean societies, like later Upper Paleolithic societies, collected and used ochre to create rock art. Nevertheless, it is also possible that the ochre traces found at Lower Paleolithic sites
Zapata (lithograph) as its source material. In the lithograph, the lightest areas in Zapata's white clothing and the white body of the horse he leads are sharply delineated against the dark background and the mid tones of the clothing of Zapata's followers. This contrast draws the viewer's attention to the figures of the rebel leader and the horse and establishes their preeminence within the composition. In his mural, "Agrarian Leader Zapata", one of the sources for the lithograph, Rivera accentuated the two figures by leaving the fresco's brilliant white plaster undercoat exposed. Though the lithograph is aesthetically inspired by the mural, the