Originally, soul flight is a technique of ecstasy used by shamans with the purpose of entering into a state of trance. During the ecstatic trance it is believed that the shaman's soul has left the body and corporeal world, not unlike an out-of-body experience, which allows him or her to enter into a spiritual world and interact with its beings. As if going into another realm, shamans either descend into an underworld (cf. katabasis or nekyia) or ascend unto an upper world (cf. anabasis) and they are in sense flying through these other places.