Here i have drawn two section out of slide 23 which were 'Heavy Stairs",
The main support of the stairs, seems to be held up by a heavy stone which
gradually gets bigger as the stairs raise. In between the stairs, there is a little metal
piece that gaps the stairs apart which supports the stairs for a perfect straight step.



And here is the original sketch i drew. The top right one.

Nolan - N.Outback V.Thinking A.Lost