Footsteps patter along the concrete-walled hall, becoming louder, more urgent, as they gain proximity. The performers, dressed in grey-white pyjamas, hurtle down the length of the bending corridor and climb over, under and around pieces of wicker furniture. In the dimly-lit, echoing expanse of the Barbican’s Curve, the effect is disconcerting. Moroccan artist, Yto Barrada,...