The closer you get to Kalu’s endless sinewy trails of old VHS tape, the harder it is to know where their forms stop and the space around them begins Nnena Kalu becomes first artist with a learning disability to win Turner prize Nnena Kalu’s forms come at you with their almost alien unknowable presence. They bulge and bifurcate and multiply. The viewer gets caught up in all the roaring, spilling, …