A natural cobble of greenstone has been smoothed and carved in low relief to portray the Aztec rain god Tlaloc, recognizable by his ringed eyes, twisted nose element, and fanged mouth. As the provider of water, Tlaloc is a patron of agriculture and holds a stalk of maize in one hand. To the Aztecs, Tlaloc was an ancient and civilized god; his worship could be traced back to the ancient ruined site Teotihuacan.