One more, completely random thought for today. Actually it occurred to me yesterday. I read James Joyce's Ulysses over 10 years ago, and certain lines from the book just jump into my mind occassionally. One common flashback is the line "inelectuble modality of the visible". I never understood what the hell that meant. Then out of the blue, yesterday, a guess occurred to me. If you can see something, it is remarkably difficult to listen to it carefully. You have no choice, you can not elect to hear what you see.
Maybe this doesn't make any sense after all.