Double staircase for a castle
A building section with two interlocking stairs — one for the castellan, one for the garrison
A large cutaway perspective shows a multi-storey building enclosing a double staircase whose two flights rise past one another without meeting. A note explains that the double stairs serve separately, one for the castellan and the other for the garrison soldiers (provisionati), keeping the two apart. A small indefinite diagram is sketched to the left.
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Double staircase in a castle section
A tall arcaded structure of several storeys is cut open to reveal two interlocking flights of stairs that climb past one another. Per the note, one stair is reserved for the castellan and the other for the garrison soldiers, so the two never share a way.