Tlaltecuhtli ("Coatlicue del Metro") VS. the Aztec Sun Stone
The central face of the Sun Stone is often seen as Tonatiuh, the sun god, because of its signature nose ornament. However, the fangs and flint knife from the mouth also implies its identity as Tlaltecuhtli. Later scholars tend to explain the face as a hybrid iconography of both Tonatiuh and Tlatecuhtli, for the sun is in the sky during the daytime, but travels underneath the earth during the night. Such explanation has a strong notion of duality, for the face relates to both the sun and the earth, male and female, and day and night.