If you take a look at the stage area that is marked "theatre", you will notice that there are five grooves in which the shutters can be moved.  They are placed progressively closer together the farther backstage they are becuase this aids in the audience's sense of depth.  Also, if you compare the size and length of the stage to the seating in the auditorium, you will notice that the stage is longer by a discernable amount.  The vast stage area, coupled with the narrow shutters, helps to further accentuate depth perception to the point where the set designer can create a far greater sense of depth than the bare stage would allow. The candles that help to light the downstage area would be placed near the orchestra pit and at the feet of the actors. Upstage, the candles would be placed near the five grooves on the stage and at the far rear.

          If you now take a look the seating area, you will notice that some of the seats face the stage at a very sharp angle. If the only good view of the stage was from the center aisle, the people sitting in these angled seats would have to strain their necks in order to see the play. However, the set designers made sure that scenery was placed on the inner sides of the stage as well, so that anyone could see the actors perform in the set.