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| Omphalos from Delphi* |
This mythic conception of the omphalos seems to be identical with the idea of a world pole or axis mundi, which can be conceived of as an umbilical cord or as a phallus. The center of the world is important as a cultic site and as the point of entry into this world in origin myths. In your world creation, starting at the center is useful and natural way of delimiting a culture or civilization both in terms of both physical and mental geography. I would consider having it as a marking a portal to the underworld or, if I was using something like the Yggdrasil as the axis mundi, I'd have it be a planar gate into the pathways between worlds/planes.
* More here.
