Some actors are chameleons, shifting drastically from one color to another depending on the role. Ryan Gosling may not be one of them: There will always be a little Ryan Gosling, even just a mischievous glimmer, in any character the actor plays. But then, that’s part of what makes a movie star a movie star: It’s impossible to separate Cary Grant from his Cary Grantness, or to think of Bette Davis without seeing an enormous pair of eyes framed by mascara fringe.