eeeeK! There's someone else under this rock! ;^) Many many years ago I help build mazes for a college art project, and the best one was totally dark. Only cardboard, but we sealed it well. Folks crawled through on hands and knees, occasionally meeting someone else in the dark tunnels, and having to squeeze by. We'd left a couple of alcoves for easier passing, but students would gather in them and TALK so every once in a while one of us got to go through and scoot them onwards. Even building it, it was disorienting to be underground in twisty passages with no visual clues. Being under a rock would be darker and not as much fun... unless we were fingerpainting, of course. Carolly