Plays can be very interesting because they can be understood in many different ways. When the writer - the playwright - makes the play, he can not say how the actors or director will use it. Sometimes the playwright is also the director or an actor: Molière, for example, was often an actor in his plays. But the director can change the play in different ways: the actors' costume, the music, how people say things, how they move or what they hold. Modern directors can direct plays by Shakespeare, and these old plays seem modern now, too.