Page from the Codex Cospi, Two aspects of Tezcatlipoca, the black aspect on the left, associated with death, black magic and the north. His robe is decorated with a skull and other bones. The figure is armed and dressed as a warrior. On the right the red aspect of Tezcatlipoca. In this form he becomes Xipe Totec, the god of sunset and sacrificial pain with the eagle down of sacrifice decorating his robe. The figure is armed and dressed as a warrior. He is killing a victim. Below him can be seen the bar and dot numerical system of the Aztecs. Mexico. Mixtec. c 1350 1500.