The artist Wolfgang Tillmans actively fought for Britain to stay in Europe with his series of posters published in the run-up to the referendum. Now that the campaign is lost and after the shocking result of the US election, Tillmans (who has a one-man show at Tate Modern until 11 June) and his long-term friend, Hans Ulrich Obrist (the Swiss-born artistic director of the Serpentine Gallery), look back at 2016 and ask what can art do in terms of society? And…
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