NB The feathered serpent (Quetzalcóatl) and Tláloc (a sort of lizard) entwine the human mountain (the temple) which in the Temple of the Moon (not the larger Temple of the Sun) hold a cave, symbolising fertility (and I assume, creation).

The two thousand year old murals and frescos are fascinating, the sinuous shape near the mouths indicate (flowery) speech:

My thanks to INAH for inviting me to Mexico and to fascinating archaeological sites such as Teotihuacan (INAH:in Spanish) and Xochicalco (see the solar hexagonal shaped overhead solar tunnel as per the below!)