This Aztec mask is made using a human skull as the foundation and deer skin backing with straps so that it could be worn during ceremonies. The mask is adorned with turquoise, lignite, pyrite, iron, and shell. The mask is a representation of a god worshiped by the Aztec who had a dual purpose. The god was a life-giving god, but also served as a guardian of the dead. The alternating colors of blue and black identify the god as Tezcatlipoca or Smoking Mirrors. The Aztec used the shiny obsidian rock to make mirrors used during ceremonies or prophesies. The artist used white shell to give outline to the shiny iron eyes and red shell inside the nose cavity.