The shape of this floor-based sculpture derives from diagrams that represent paths of light; pitch-black in colour, it suggests a black hole. The leather-clad surface is drawn from a 15th century painting by Ercole de’ Roberti. ‘John the Baptist is standing on the World, which has a weird flaky slate-like surface, and then maybe because the painting is hung too high, or his face is badly done you can’t really see his head…it’s all about the feet.’ Bea McMahon