The Nunnery quadrangle, The East Building Several vault tops have been recovered with the original paint representing partial calendrical dates from 906 to 907 AD consistent with the Chan Chahk’ahk Nalajaw period of government. The formal entrance suggests it may have been a royal palace with administrative and non-residential functions, where the ruling group must have had meetings to collect the tribute, make decisions, dictate sentences, among other activities. It is one of the structures probably used for healers, astronomers, mathematicians, shamans and priests. The building is on a low platform and has five doorways into a complex of fourteen rooms. The Puuc frieze consists of triangular-shaped lattice patterns and Itzam-Ye (or Chac/Tloloc) masks at the corners and middle of the frieze, Uxmal Another iguana is posing in this photo too. The limestone buildings of Uxmal oriented along a north-east axis. Building façades are divided horizontally into two distinct parts - a plain lower portion and a highly decorative upper section.