The uniqueness of actor
Actor is the part that meets directly with the audience, directly related, directly viewed in their entirety. The Actor that's make the show live and have soul, so the show to be interesting to see.
Actor also berbeda with another part of artistic crew, another crew could detach himself from his expression tool but not for the actors. Like a stylist setting, he can release his expression tool because he was beyond himself.
But an actor can not be so, the tool expression can not be moved elsewhere because of his expression tool tightly attached to him, because it is a tool that gave rise to his voice, imagination, movement and the role of the mind.