Kelley Walker's *diameter 24 in. (61 cm)* is a laser-cut polished stainless steel work that transforms its title—a straightforward measurement—into the artwork itself, blurring the line between object and descriptor. The mirror-like surface of the steel reflects its surroundings, implicating the viewer and the environment in the piece while underscoring Walker's ongoing interest in circulation, reproduction, and the language of commodities. The work exemplifies his conceptual approach, using industrial materials and processes to probe the systems through which objects and information are produced and consumed.