Two separate but close plates, one the floor the other the roof, this last seemingly miraculously holding up on slender pillars which touched turn out to be soft ropes, increasing the prodigy of the construction. The real supports are therefore hidden among the false ones.
The ropes create a small thicket, now sparse now denser.
One could play at traversing the space without touching any of the strings, or discovering the “hard” ones, or at….