 As we have seen, any plausible theory of depiction will need to accommodate the wide variety of styles of picture-making. Art history contains more sophisticated and fertile treatments of the concept of style than philosophy does, notably by Heinrich Wolfflin (1950), Alois Riegl ([1893] 1992), Erwin Panofsky (1997), Ernst Gombrich (1968), and Meyer Schapiro (1994). However, one topic in the theory of style on which there is a substantial philosophical literature is realism.