Healing altars (mesas) in Northern Peru often follow the old tradition by including all kinds of "power objects,"…Objects such as seashells, pre-Columbian ceramics, staffs, stones, etc. are very common on Peruvian mesas, and are blended with Christian symbols such as crosses and images of saints.
Source: Bussmann, R. W., & Sharon, D. (2006). Traditional medicinal plant use in Northern Peru: tracking two thousand years of healing culture. Journal of Ethnobiology and Ethnomedicine, 2, 47.