Why the rosettes image may not be a map at all

[Anton]

The upper right circle I believe represents the Earth. Most of the buildings are in or near this circle, and just outside it is a T-O map.

That's an interesting perspective, it did not occur to me that this T-O map may indeed be looked at from this angle.

I think one of the main problems with your suggestion is that some circles are connected with walls. Why would extra-terrestrial objects be interconnected with such terrestrial structures as walls?