The Irish painter Brian Maguire is an artiste engagé, a secular missionary who devotes his talent to a form of social protest. He has taught painting to poor children from Palestine to Brazil, and to prisoners all over the world. At his atelier in the working class reaches of northern Paris, Maguire has just completed a series of paintings on the migrant crisis, because “what an artist has to do is reflect their time . . . That’s really what I’m trying to do, to reflect what is for me the biggest story in Europe – those deaths in the Mediterranean.”