The ancient dolmens served as a place for meditation or were used as a sacrificial altar. The Druids went to dolmens to get information from the light and shade thrown by the stones in the course of the day. Rudolf Steiner regarded dolmens as place where intuitive knowledge of the activity of light had been made possible for a spiritually trained priest or shaman. In the cromlechs, the Celtic Druid had a vital relationship with the sun calendar of the year, which was used as a basis for decisions about sowing and harvest. Also used as human graves, bones and ashes have been found at almost all the sites of cult stones.