In a way, this is a definition of shamanism. A shaman is a person who by some means has gotten out of their own culture.
Terence McKennaNothing is as boundary dissolving, except for psychedelic compounds, as travel. Travel is up there.
Terence McKennaShamanism is not some obscure concern of cultural anthropologists. Shamanism is how religion was practiced for its first million years. Up until about 12,000 years ago there was no other form of religion on this planet. That was how people attained some kind of access to the sacred.
Terence McKenna