3. Carolyn: The artist Marc Quinn has displayed, behind a glass plate, biologically replicated fragments of Sir John Sulston’s DNA, calling it a “conceptual portrait” of Sulston. But to be a portrait, something must bear a recognizable resemblance to its subject. Arnold: I disagree. Quinn’s conceptual portrait is a maximally realistic portrait, for it holds actual instructions according to which Sulston was created. The dialogue provides most support for the claim that Carolyn and Arnold disagree over whether the object described by Quinn as a conceptual portrait of Sir John Sulston