How does Euripides use imagery in The Bacchae?

By the time Sophocles wrote Oedipus the King in the late 5th century B.C., the conventional size of the chorus had been fixed at fifteen. The chorus continued to sing, chant, and dance and occasionally interacted with the principal characters, but most often, as in The Bacchae, they stand outside the action and provide the audience with important background information, sometimes commenting on what they see happening or even warning characters that their choices may prove dangerous. Typically, the singing and dancing of the chorus occur during choral interludes that divide the episodes of the play. These interludes may help suggest the passing of time, as when the Chorus of Dionysus's followers in The Bacchae chant an appeal to the god for justice while Pentheus goes off to face his death. Practically speaking, they also may help delay the action in the play while scenery is replaced or actors change costumes to appear in other roles. Of the three Greek tragedians whose work has survived, Euripides used the chorus least, preferring instead to allow his individual characters more time to develop his themes