Fences
Troy Maxson, a former Negro League baseball player now working as a garbage collector in 1950s Pittsburgh, builds a fence around his yard while his family life collapses. Wilson's masterwork in his ten-play Pittsburgh Cycle. Troy is a tragic hero who can't stop fighting battles that are already over, and the fence is every metaphor at once.
Wilson names the metaphor in the title, then has Bono explain it onstage in case you missed it: some people build fences to keep people out, some to keep people in. Troy is so large that everyone else shrinks to audience for his arias, and Gabriel's trumpet finale swerves into mysticism the play has not prepared. On the page, without an actor, the speeches read as speeches.
The case for it and the rest of the canon open with Pro.
