Take a look at page 44 (The house of the moon). Notice the stairs leading from area B1 to area B2. The holes in the floor trough which the stairs descend are just 5 feet brought. This is an architectural folly, because it implies that the stairs are so steep, that a human could descend in this small space without banging his head.
For someone being about 1,80m (about 6 foot) tall this means even if one stair is only 15cm (0.5 ft) broad it would have to be 30cm (1 ft) high.
But only if the bottom/ceiling itself has no height, which is unlikely/impossible.
Meaning the stair have to be steeper still.
Greetz
Ganzir
Of course one could state, that there is a ladder instead of the staircase, in other parts of the building there are ladders as well, but this would be a ladder with a breadth of 15 feet .... looks kind of strange.
Greetz
Ganzir
