 The second difficulty with (1) is that digital photographs would normally be classified as pictures along with analog ones (Bach 1970; Kulvicki 2006); and some diagrams, which would not normally be classified as pictures, are analog and relatively replete (Peacocke 1987). Furthermore, outline drawings are less replete than diagrams in which not only shape but also colour affects what they represent, but the former would normally be classified as pictures, whereas the latter would not (Schier 1986; Kulvicki 2006). Goodman acknowledges that “some old and vague boundaries are transgressed, some significant new alliances and alienations effected” by the classification of symbol systems he defends (1968: 232), but it is debatable how revisionist his theory can be, without ceasing to be a theory of depiction. For we want to know how pictures, including digital photographs, represent. It is possible to claim, in reply, that depiction is not the unitary phenomenon we naïvely imagine it to be. But this cannot be established merely by showing that Goodman’s theory of symbols precludes a unitary explanation of depiction.