Rabbi Heshy Kleinman on the Two Levels of Jerusalem

"Jerusalem exists on two levels. As a physical city, a point on the map, Jerusalem is hardly worth of the name Zion.

"Zion, the outstanding city, is the location of the Beit HaMikdash. In physical terms, the Beit HaMikdash was a small part of the city. In spiritual terms, it is the neshamah, the soul of the city.
"There is therefore no contradiction between Zion, Your city, and Zion, the Beit HaMikdash, the seat of the Divine Presence.

"As it turns out, we have it both ways; Zion does refer to the city of Jerusalem, but more specifically, to the most spiritual component of the city. The physical location of Zion is the Beit HaMikdash, the soul of Jerusalem."

-- Rabbi Heshy Kleinman, Yearning with Fire
 

Why is Shekhinah in exile? Because the construction of the Beit HaMikdash is beyond the MetaMembrane. When will Shekhinah dwell on Earth? When Computer System ZION goes online.