Board Thread:Questions and Answers/@comment-33636382-20171113044643/@comment-26484417-20171113225751

If I remember correctly, Baam was already considered to be outside--just not quite out in the open.

Actually, the Tower might be in another dimension, plane, or universe (however the author calls it) altogether, but that pretty much avoids all interesting concerns. For instance, one of the interesting things about the Tower being physically located in the world of the story is that--regardless of whether it's above ground, below ground, or a combination of both--either the world (i.e., the planet) would have to be humongous, or the inside of the Tower is subject to some scale compression; I cannot think of another way a single planet could accommodate a Tower that contains so many fairly huge Floors. Which, of course, begs the question whether the reason no one can leave the Tower is not because it's impossible to leave, but because there is no known mechanism to decompress the Tower's content--and people from the Tower don't particularly wish to leave it only to be crushed to death by, let's say, dust particles. (NOTE: Hilarious thought, though... ^^)