Among the various symbols of Beltane frivolity, the Maypole is probably the most well known, even to non-Pagans.
On the surface, the tall Maypole is simply a phallic symbol to reflect the fertility of the season. But it originates with the ancient Irish story of the Bile Pole. The Bile Pole was a sacred tree of life that grew up through the Earth to join the Heavens above and the Otherworld beneath. A similar story to the Norse tree, Yggdrasil.