There is no one better equipped to build rich authentic characters than someone who has actually “lived” (for a few hours) as someone else. In order to appear authentic on stage, an actor has to be able to respond to cues and events AS THEIR CHARACTER. If they don’t, the performance is flat and uninteresting. Writers are striving for that same authenticity… and suffer the same consequences if they fall short of the mark. So how do actors do it?