The device of a disruptive outsider entering a claustrophobic environment is another recurring theme. In plays where this occurs, the outsider will commit some apparently liberating act of evil (rape in "Brimstone and Treacle") or violence (murder in "Shaggy Dog") that gives physical expression to the unsublimated desires of the characters in that setting. While these more malevolent visitors are often supernatural beings ("Angels Are So Few"), intelligence agents ("Blade on the Feather") or even figments of their host's imagination ("Schmoedipus"), there are also—rare—instances of benign visitors whose presence resolves personal conflicts rather than exploits them ("Joe's Ark"; "Where Adam Stood").