You cannot just walk out the door; you must wait for a machine to carry you. Capricious machine, it sometimes takes so long you think to descend all twenty-six opulent floors by the stairway. But you're not sure if the stairway would let you out, if an alarm would sound, for months you didn't even know where the stairs were.

Towers trap. We've known this since history and fairytale. The only benefit they afford is long sight, which you need either to fight off a horde or to dream your way out of the center of a city.