Churchill's use of language is very spare, with characters talking in fragments and half-completed sentences. While it's true that people often talk this way in real life, there's a stylized quality to the verbal exchanges that heightens the dramatic tension of the play. When Salter finally does let loose with a confessional rant to one of his sons, it's jolting. Additionally, Salter often speaks in half-truths or outright lies, forcing audience members to re-evaluate what they have already heard as more information becomes available.
As the play begins, Bernard (Dallas Roberts) has just learned that there are "a number" of clones of him -- maybe even as many as 20 -- running around. Salter assures Bernard he's the original, but he's lying. This fact is made clear by the return of the original Bernard (also played by Roberts) in the next scene. Of course, the two Bernards are unlike each other in every way except for physical appearance. The first one we see is a good-natured jumble of nerves, whereas the one who returns to visit his estranged father is a bitter individual who moves about like a cat and speaks with quiet menace.
While obviously contributing to the nature/nurture debate, A Number also raises provocative questions about the capacity for love and forgiveness. Salter has managed to produce two genetically identical sons with completely different personalities, yet his parenting skills are still in question. The discarded son has every right to be angry but so does the one whom Salter raised. And then there's the question: Can Salter atone for his actions? "I did some bad things. I deserve to suffer," he declares. "I did some better things. I'd like recognition."
As played by Shepard, Salter is quiet and withholding with both sons; love and affection are there, certainly, but also a reluctance to really communicate. Director James Macdonald has Shepard seated on a couch for almost the entire play, so it's a good thing that the actor is a captivating stage presence. Salter's unwillingness to move more than a few inches on the couch says volumes about just how close he is to the Bernards. But in the final scene -- when Salter meets yet another clone, this time named Michael (Roberts once again) -- there's a suggestion that he may have changed.
As the three variations of Salter's progeny, Dallas Roberts is terrific. He makes each character distinctly different without resorting to caricature. The pain beneath the original Bernard's sullen persona is evident; so is the fear and uncertainty of the other Bernard, who is forced to question the truth of everything he thought he knew about himself. Michael is a completely different creation and his attitude brings out a different side of Salter, previously unseen.
As for set pieces, there's only a brown leather couch and a single standing lamp. The play's primary illumination, however, comes from an enormous flood light positioned above the couch. (Edward Pierce is the lighting designer.) Shepard, who never leaves the stage, remains in the same outfit for the entire play, while costume designer Gabriel Berry gives Roberts a new ensemble for each scene, helping to convey the passage of time and to indicate which role the actor is playing.