Turner prize 2016 shortlist features buttocks sculpture and choo-choo train

Anthea Hamilton, Michael Dean, Helen Marten and Josephine Pryde earn place on shortlistIt sparks excitement and joy in some, bemusement and fury in others and this year’s most coveted prize in British contemporary art – the 2016 Turner prize – is unlikely to buck the trend.This year’s artists include the creator of an 18ft sculpture of a man’s bare buttocks, another obsessed by corrugated shop window shutters, another whose sculptures are described as “slipper