You spend your life training to be an actor, observing people's characteristics so that you can design characters around what you've seen.
Clint EastwoodWhen I used to be a contract player in 1954 at Universal, I wasn't getting good roles. I was getting one-liners, and then I'd be gone. But I'd hang around; I'd watch guys. And when I had days off, which was most days, I'd go down and watch other sets while they were shooting. Watch Joan Crawford or whomever. Just watch how they worked and how the director handled them. I didn't know anything about making movies, and there's a lot to learn.
Clint Eastwood