We're selective about sound, we tune out things, or maybe you overhear something - and that's an area that's as yet totally unexplored.
I stayed at MGM for about two years, and in that time I became part of the camera crew and worked my way up to be a focus puller.
So quite a lot of people who've come into cinema from the commercials world have had to learn the very fact of what cinematography is over again.
Soon, just as people can now go to Rymans and buy paper to start writing a book, they'll be able to get stuff to start shooting a film.