It's the bindu or seed of the city that grew around it in a dynamic play of subtle energy. It's a manifestation of Primordial Awareness. The experiences people have here are preliminary. They represent only the first level of initiation. People today in their desperate search experience a twinkling of sacredness here and then believe they understand the whole mystery.
Sacred geometry is only one of many starting points.
Then there's the question of whether they ever actually do understand it. The Mass itself appears as a parody of the Magnum Opus. The Mass is not a parody of the Magnum Opus. The Mass is an exact manifestation of the Magnum Opus. Most Parisian Catholics have no idea of what they're about.