At present we must pass on to observe that, in the second place, the work of the dramatist is conditioned by the fact that he must plan his plays to fit the sort of theatre that stands ready to receive them.  A fundamental and necessary relation has always existed between theatre-building and theatric art.  The best plays of any period have been fashioned in accordance with the physical conditions of the best theatres of that period.  Therefore, in order fully to appreciate such a play as Oedipus King, it is necessary to imagine the theatre of Dionysus; and in order to understand thoroughly the dramaturgy of Shakespeare and Moliere, it is necessary to reconstruct in retrospect the altered inn-yard and the converted tennis-court for which they planned their plays.  It may seriously be doubted that the works of these earlier masters gain more than they lose from being produced with the elaborate scenic accessories of the modern stage; and, on the other hand, a modern play by Ibsen or Pinero would lose three-fourths of its effect if it were acted in the Elizabethan manner, or produced without scenery (let us say) in the Roman theatre at Orange.

Since, in all ages, the size and shape and physical appointments of the theatre have determined for the playwright the form and structure of his plays, we may always explain the stock conventions of any period of the drama by referring to the physical aspect of the theatre in that period.  Let us consider briefly, for purposes of illustration, certain obvious ways in which the art of the great Greek tragic dramatists was affected by the nature of the Attic stage.  The theatre of Dionysus was an enormous edifice carved out of a hillside.  It was so large that the dramatists were obliged to deal only with subjects that were traditional,—­stories which had long been familiar to the entire theatre-going public, including the poorer and less educated spectators who sat farthest from the actors.  Since most of the audience was grouped above the stage and at a considerable distance, the actors, in order not to appear dwarfed, were obliged to walk on stilted boots.  A performer so accoutred could not move impetuously or enact a scene of violence; and this practical limitation is sufficient to account for the measured and majestic movement of Greek tragedy, and the convention that murders and other violent deeds must always be imagined off the stage and be merely recounted to the audience by messengers.  Facial expression could not be seen in so large a theatre; and the actors therefore wore masks, conventionalised to represent the dominant mood of a character during a scene.  This limitation forced the performer to depend for his effect mainly on his voice; and Greek tragedy was therefore necessarily more lyrical than later types of drama.