This article is from the Religion-Shamanism FAQ, by Dean Edwards, Stef Jones, Jilara, Jane Beckman, Ann Albers with numerous contributions by others.
A symbolic representation of Spirit
as the axis mundi or center of the world. With its roots deep in
the Earth and its uppermost branches reaching out into the
heights of the heavens, the World Tree symbolizes the presence
and flow of Spirit upon which shamans and other esoteric
practitioners are said to ascend and descend in their journeys.
Dean Edwards (firstname.lastname@example.org)
Universal symbol for the connection between heaven and earth
Ann Albers (email@example.com)