Ann asked:
Okay. In such a room the light would disappear because it was absorbed by the perfect black color of the walls, floor and ceiling. But I have never seen such perfect blackness here on Earth. Have you?
Yes.
Many years ago, my parents took us on a trip where we walked deep into the earth in a cavern in Arkansas. At one point, in a 'room' deep in the cave where there was nothing to bump into (if we didn't walk around) and no place to fall, the guide turned off the light at told us that we were too far underground to see anything without artificial light. Our eyes would never -
never - adjust to the reduced light level because there was absolutely no light in the cavern.
He left the lights off for about twenty seconds and everybody got very uncomfortable. Unless you've experienced total darkness, you don't know what it means. And I don't have any way to explain it any better than that. I don't think there's any frame of reference for it, unless a person is already completely blind.
