Scott MacDonald on Beasts of the Southern Wild star Quvenzhané Wallis: “Though she’s nine now, she was a mere six when the film was shot. To put it another way, she was not quite seven, which is the year developmental psychologists like to refer to as the age of reason: when kids start making decisions based on logic and causality. I’m no psych expert, but it seems to me this might be the sensible cut-off point for acting plaudits.”