Alex Ritman Andrea Arnold’s initial inspiration for her Cannes competition entry “Bird” was perhaps not what many people might have been expecting. “A very long time ago, I had the image a tall, thin man with a long penis, standing on a roof,” she explained at the press conference for the film on Friday when asked about her initial visual prompt. “But I didn’t know if he was good or bad or what he was.” From this bizarre starting point, Arnold crafted a social realist drama about a family on the fringes of society living by British seaside and an unexpected visitor who becomes close to a young girl entering puberty.