Have you ever been down...
Have you ever been down a cave? The tour guide leads you down into the bowels of the
earth. There are lights lining the side of the trail; guardrails keep you from falling into
one of the many drop-offs. One thing the guides often do when the tour is at the bottom
of the cave is turn out the lights. It is absolutely pitch black. You cannot see your hand in
front of your face. Even when they leave the lights off for a minute or two (and that
seems like an eternity) your eyes do not adjust to the darkness. You still can't see. What a
