Outlining an ethics of documentary making in The Image You Missed, the late, acclaimed film-maker Arthur MacCaig (via Ernest Larsen’s crisp, twangy voiceover) describes the subject of the lens’ gaze as one who is forced to ‘account for themselves’ — their choices and responsibilities and lived experience. Who are you? And why are you doing what you’re doing? McCauley’s son Donal Foreman, Image’s director and editor, uses his own film to turn the camera’s scrutiny back on his absent father, producing an engaging, clever consideration and critique of MacCaig’s legacy, of political docs more generally, and of the subtle differences between looking at…