Doing work which has to be done over and over again helps us recognize the natural cycles of growth and decay, of birth and death, and thus become aware of the dynamic order of the universe. "Ordinary" work, as the root meaning of the term indicates, is work that is in harmony with the order we perceive in the natural environment.
Fair use is a part of United States copyright law. You don't know if it falls under fair use until you go to court. Someone has to sue you and then you have to challenge it.