I've found that an actor's work has life and interest only in its execution. It seems to wither away in discussion and becomes emptily theoretical and insubstantial. It has no rules except perhaps audibility. With every play and every playwright the actor starts from scratch as if he or she knows nothing and proceeds to learn afresh every time, growing with the relationships of the characters and insights of the writer. When the play has finished its run the actor is empty until the next time...and it is the emptiness which is, I find, apparent in any discussion of theatre work.