There are a couple of obvious ways of looking at this. Yes, there are more than two ways, but I'm going to focus exclusively on the obvious ones.
First, trapdoors. I said it. You read it. Trapdoors. We've all seen them in at least one capacity; usually as a piece of flooring that can be made to rapidly, suddenly and unexpectedly fall out from beneath a person. But what's beneath the trapdoor? What's at the bottom of that shaft in which the person just hilariously fell? For the unimaginative....nothing. Just another floor some distance below the one they just fell through. For the l