Very nice! The underlying city texture is a bit peculiar--that appears to be a satellite image of a modern city. It does give me an idea, though:
In the Old Testament (Daniel, I think), there's a reference to angels being assigned to particular cities. Angels, of course, don't exist in our physical universe, but they obviously relate to it somehow. So what if there were a sort of celestial overlay--a spiritual city that exists on top of a physical city, with its own districts, streets, and neighborhoods. Events in one realm might affect things in the other.
Okay, that's enough hijacking of a welcome thread. Hi, and welcome to the Guild! I hope you learn a lot and do plenty of teaching as well!