the dome and arch had begun to appear in the architecture of Rome, and therewith — as Spengler recognized — the world-feeling of the rising Levant was announced… The mosque, in contrast, was all interior: an architectural likeness of the world-cavern
Campbell, via Spengler, argues that the dome inaugurates a new cosmological ‘world-feeling’ — the sacred interior space as image of the universe — marking the shift from Classical exteriority to Levantine interiority.
, Occidental Mythology: The Masks of God, Volume III, 1964thesis