  Guy Rohrbaugh (2003) argues that even in the case of repeatable works such as photographs, the category of types does not adequately capture at least three fundamental features of works of art: temporality (they come into existence and can cease to exist), temporal flexibility (some of their qualities can change over time), and modal flexibility (a work could have had properties other than those it actually has). According to Rohrbaugh, type theories cannot accommodate this kind of modal flexibility. He proposes instead that works of art should be conceived of as historical individuals that persist through time.