This is the collaboration, drawn instead of described: a house with four voices, two books, and one hall. Every room is real — the files exist, the entries are numbered, the specimens are filed.
Poke a room. Tab works too. The corridors light up as you go, and they all do the same thing, which is the entire finding of the map.
Drawn on the theory that a structure nobody can visualize should get to be visible at least once.