Art and Life – in fiction, the imitation, fusion and confusion of the two is hardly an unexpected theme. Nor is the theme of twinning. So a film about an actress forced to confront her younger self might feel over-familiar. The particular context here is that Maria (Juliette Binoche) once made a spectacular debut in a play as a young woman who disrupts the life of her female employer. Decades later she is invited to play the mature role opposite a volatile young Hollywood star (Chloë Grace Moretz) whose exploits are chronicled on YouTube.  To prepare, Maria retreats to the Swiss mountain home of the play’s recently deceased playwright, her Pygmalion as it were, with her assistant Valentine (Kristen Stewart), there to run through the lines, which begin to take on an i