Plays were performed by daylight in the open air, in theatres so constructed that most of the audience was at a considerable distance from the actors. These circumstances naturally had a great effect upon the conventions of the theatre and the manner of acting, as effects must be broad, characters must be typical rather than individual, and facial play was impossible (fig. 17). Early in the history of the Greek drama masks for the actors were introduced, and continued in use for both tragedy and comedy. They were usually made of linen stiffened with clay and painted, though cork and wood were also used. The pupils of the eyes were perforated so that the actor could see, and the mouth was always open. In Case 1 are two terracotta masks, possibly made for use, one of a satyr (see tail-piece, p. 18), the other of a young woman, and two little masks representing comic characters. In the same room above Case 4 is a large tragic mask of marble (fig. 15). This fine piece of decorative work is modeled after the masks worn by the heroes of the tragic stage. Above the tragic mask rose a projection called onkos which increased the apparent height of the wearer. For the same purpose a shoe with a very thick sole, the kothornos, was worn; the height of onkos and kothornos varying with the importance of the character. The dress of the tragic actor corresponded in a general way with that of every-day life, but the chiton was long, and the costumes were frequently bright in color and decorated elaborately with woven or embroidered bands. [Illustration: FIG. 15. TRAGIC MASK] [Illustration: FIG. 16. SLAVE IN OLD COMEDY] [Illustration: FIG. 17. THEATRE AT EPIDAURUS] [Illustration: FIG. 18. ACTOR OF MIMES]