The San religion is the religion of the San people.
To enter the spirit world, trance has to be initiated by a shaman through the hunting of a tutelary spirit or power animal. The eland often serves as power animal. The fat of the eland is used symbolically in many rituals including initiations and rites of passage. Other animals such as giraffe, kudu and hartebeest can also serve this function.
One of the most important rituals in the San religion is the great dance, or the trance dance. This dance typically takes a circular form, with women clapping and singing and men dancing rhythmically. Although there is no evidence that the Kalahari San use hallucinogens regularly, student shaman may use hallucinogens to go into trance for the first time.
Psychologists have investigated hallucinations and altered states of consciousness in neuropsychology. They found that entoptic phenomena can occur through rhythmic dancing, music, sensory deprivation, hyperventilation, prolonged and intense concentration and migraines. The psychological approach explains rock art through three trance phases. In the first phase of trance an altered state of consciousness would come about. People would experience geometric shapes commonly known as entoptic phenomena. These would include zigzags, chevrons, dots, flecks, grids, vortices and U-shapes. These shapes can be found especially in rock engravings of Southern Africa.