It's really amazing how much feedback I get from hearing. I use it to know when my fork is slipping off my plate, so the fork doesn't fall completely and spill lasagne on the floor. I use it to know mwhen I've hit the right number of keys on the keyboard, to be aware of typoes and misses. Without hearing I'm unaware of anything behind me, as if that part of the world were blank instead of something that stays in my background awareness. This is just stuff I've figured out wearing Juggler's ear protection while sitting at the computer in the last fifteen mins. I'm sure there's more.