What are the motifs in A Delicate Balance: A Play by Edward Albee?

Fear could easily be argued as another character in Albee's play. It is an unnamed fear that moves Harry and Edna out of their house and into the middle of the chaos in the home of Agnes and Tobias. As Harry and Edna explain it: "WE GOT . . . FRIGHTENED." "We got scared." We . . . were . . . terrified." The fear is described as darkness, as when Agnes says: "I wonder if that's why we sleep at night, because the darkness still . . . frightens us?" Agnes also labels fear as "the terror. Or the plague," and she states that Harry and Edna have brought the plague with them. And she claims that the only solution is isolation.