The centerpiece of Tenochtitlan was the Templo Mayor, the Great Temple, a large stepped pyramid with a double staircase leading up to two twin shrines – one dedicated to Tlaloc, the other to Huitzilopochtli. This was where most of the human sacrifices were carried out during the ritual festivals and the bodies of sacrificial victims were thrown down the stairs. The temple was enlarged in several stages, and most of the Aztec rulers made a point of adding a further stage, each with a new dedication and inauguration. The temple has been excavated in the center of Mexico City and the rich dedicatory offerings are displayed in the Museum of the Templo Mayor.[81] Archeologist Eduardo Matos Moctezuma, in his essay Symbolism of the Templo Mayor, posits that the orientation of the temple is indicative of the totality of the vision the Mexica had of the universe (cosmovision). He states that the "principal center, or navel, where the horizontal and vertical planes intersect, that is, the point from which the heavenly or upper plane and the plane of the Underworld begin and the four directions of the universe originate, is the Templo Mayor of Tenochtitlan". Matos Moctezuma supports his supposition by claiming that the temple acts as an embodiment of a living myth where "all sacred power is concentrated and where all the levels intersect".[82][83]