The Roman mundus was a circular trench divided into four parts; it was at once the image of the cosmos and the paradigmatic model for the human habitation.
Eliade identifies the trench as a cosmogonic symbol: the Roman mundus, a circular trench quartered to mirror the cosmos, functions as the paradigmatic axis mundi around which sacred human settlement is organized.
, The Sacred and the Profane: The Nature of Religion, 1957thesis