Collecting, sorting, stacking, and layering material is a working process that Tony Cragg has repeatedly tested as a sculptural principle since the 1970s. ,Stack’ (1975) in the Tate Gallery collection is an early example. ,Stack’ (2019) stretches the thematic arc further; here, facial profiles are layered and fanned out. The sculpture's form is reminiscent of geological formations and seems to push against gravity in a powerful movement.