That might be the case because you cannot have distractions. Years ago, I also saw a tidbit about how TV and Movie Productions have people whose only jobs are to have background people NOT look at the camera, say when they are filming on a New York Street or something. I had a USAF Bud who did Construction in the heart of New York City. He said there are sooooooooo many cameras around for TV, Movies, Commercials, Documentaries etc that most people find them easy to ignore.
