The Mexica viewed the sea as extending outward and up until it merged with the sky. The sky was known to contain water which descend on the Mexica as a flood or life giving sustenance.
Some legends have four trees holding the sky at the corners of the world.
There are many legends concerning creation myths, consult Duran, Sahagun, and Brundage. The glyph was in the form of an eagle's beak as he sat on the cactus where Tenochtitlan was founded. Symbolized the screaming of the eagle for war. The Mexica thought war was an influence of the sun. All gods took pleasure watching the exertion of battle, the chaos.