In the gateway serpents, antlered shamans, and human-animal cross forms pictured in these ancient murals, Carolyn E. Boyd sees a way that ancient hunter-gatherer artists could express their belief systems, provide a mechanism for social and environmental adaptation, and act as agents in the social, economic, and ideological affairs of the community. She offers detailed information gleaned from the art regarding the nature of the lower Pecos cosmos, ritual practices involving the use of sacramental and medicinal plants, and hunter-gatherer lifeways.