adywan said:

Those windows would be on the inside and not the outside of the building because the corridor goes all the way around, so it would be more like a central courtyard. But the way they are designed, they are more like ornate lighting than actual windows.

Oh okay. I always thought those were decorative windows to the outside, just like the kind you might find for a bathroom.. which only let light through and nobody can see when the rubber ducky is taking his bath:

But your explanation is definitely a possibility too. In fact, I really like your idea over "bathroom windows" because that's absolutely suitable for here - any architect is entitled to choose artificial instead of natural lighting wherever he wants to, even if it is a city in the sky :) That also explains why you made the window/Lea smaller on the tower, to help convince us that a hallway could possibly fit along there.

Thank you Ady