I think the idea is simply that it's inaccessible -- there, off-screen, but not reachable. A fictional framework to explain why the toons have appeared in Millennium City, and why they may reappear in Paragon if COH returns somehow.
-- Bob
---------
Then the horns kicked in...
...and my shoes began to squeak.
-- Bob
---------
Then the horns kicked in...
...and my shoes began to squeak.