Finally, the planning and construction of the stone-walled galleries, in particular, suggest a hierarchical system. In addition to the requirement to command and direct the manpower required, the galleries show unique planning. They allowed only one entrance; this is atypical of the time when rooms commonly had multiple entrances and exits. The iconography on the walls of the stone galleries is highly complex. The complexity suggests that only a select few people were able to understand the iconography; such people would serve as translators for the few others who were privileged to view the stone galleries. The limited access, both physically and symbolically, of the stone-walled galleries, supports the existence of a shaman elite at Chavín de Huantar. The evolution of authority at Chavín appears to have resulted from a planned strategy by the shamans and those who planned and constructed the ceremonial center.