El Palacio has a large mask of the rain god Chac over the front door. As in other cities in the Puuc region, which has almost no rivers or streams, a great reverence to Chaac is shown in the numerous representations of this deity. On one corner of the building a serpent opens his mouth revealing the head of a human. Notice the intricate geometric forms and patterns carved into the trim work. Each design has a specific meaning in the cosmology of the Maya.