Between and beyond the arcs were scenes of modern social life. Wealthy society women were seen playing cards and smoking at the left. Opposite, on the right, Lenin was seen holding hands with a multi-racial group of workers. Soldiers and war machinery occupied the top left above the society women, and a Russian May Day rally with red flags was seen at the right, above Lenin. For Rivera, this represented contrasting social visions: the "debauched rich" watched by the unemployed while war raged, and a socialist utopia ushered in by Lenin. Beyond the giant lenses to left and right were depicted figures contemplating the central scene, behind which were gigantic classical statues. The one on the left depicted an angry Jupiter, whose raised hand holding a thunderbolt had been severed by a lightning strike. This comprised "The Frontier of Ethical Evolution". The one on the right was a headless seated Caesar. This comprised "The Frontier of Material Development". For Rivera these represented the replacement of superstition by scientific mastery of nature, and the overthrow of authoritarian rule by liberated workers.