Painting the unpaintable: Gerhard Richter’s most divisive work returns to Auschwitz

The artist’s Birkenau cycle is based on the only pictures taken by prisoners at the Nazi death camp. As it goes on show next to its source, does it still have the power to shake us?At the opening of a new exhibition hall in the Polish town of Oświęcim last week, a curious crowd of visitors seemed impressed with the purpose-built architectural structure: a minimalist, Aldo Rossi-like building that feels more like a tomb than a gallery. They initially remained more sceptical of the