  Many other writers have, on the contrary, stressed the singularity of at least some works of art and/or some of their constituents. Croce’s influential (1903) diatribe against the “science” of genres stands at the top of a list that includes George Boas (1937), Henri Focillon (1934, 56), Souriau (1947, 70), Stuart Hampshire (1952), Ingarden (1962), Nelson Goodman (1968), Richard Wollheim (1968), Wolterstorff (1975, 1980), Catherine Lord (1977), Mark Sagoff (1978), E. J. Lowe (1983), Levinson (1987, 1996), Gérard Genette (1994), Anthony O’Hear (1995), Irvin (2008), and Michael Weh (2010).