But beyond this, he is a psychopomp, and he may also be a priest, mystic, and poet. If we define shamanism this way, Eliade claims, we find that the term covers a collection of phenomena that share a common and unique "structure" and "history". (When thus defined, shamanism tends to occur in its purest forms in hunting and pastoral societies like those of Siberia and Central Asia, which revere a celestial High God "on the way to becoming a "deus otiosus"". Eliade takes the shamanism of those regions as his most representative example.) In his examinations of shamanism, Eliade emphasizes the shaman's attribute of regaining man's condition before the "Fall" out of sacred time: "The most representative mystical experience of the archaic societies, that of shamanism, betrays the "Nostalgia for Paradise", the desire to recover the state of freedom and beatitude before 'the Fall'." This concern—which, by itself, is the concern of almost all religious behavior, according to Eliade—manifests itself in specific ways in shamanism. According to Eliade, one of the most common shamanistic themes is the shaman's supposed death and resurrection. This occurs in particular during his initiation. Often, the procedure is supposed to be performed by spirits who dismember the shaman and strip the flesh from his bones, then put him back together and revive him. In more than one way, this death and resurrection represents the shaman's elevation above human nature. First, the shaman dies so that he can rise above human nature on a quite literal level. After he has been dismembered by the initiatory spirits, they often replace his old organs with new, magical ones (the shaman dies to his profane self so that he can rise again as a new, sanctified, being). Second, by being reduced to his bones, the shaman experiences rebirth on a more symbolic level: in many hunting and herding societies, the bone represents the source of life, so reduction to a skeleton "is equivalent to re-entering the womb of this primordial life, that is, to a complete renewal, a mystical rebirth". Eliade considers this return to the source of life essentially equivalent to the eternal return. Third, the shamanistic phenomenon of repeated death and resurrection also represents a transfiguration in other ways. The shaman dies not once but many times: having died during initiation and risen again with new powers, the shaman can send his spirit out of his body on errands; thus, his whole career consists of repeated deaths and resurrections.