 As said, painting stands at the opposite extreme from a notational system, since works in this art form are “analogs,” characters in syntactically and semantically dense systems. It is important to emphasize how that does not mean that a classification of paintings according to a notational system could not be found, or even found easily: a library-type classification for paintings for instance. What it does mean, however, is that, given the history of the medium and of the ways of classifying works of painting, a library-type notation would be incompatible with established artistic practice. The painting itself (or, in the case of etching, only the prints using the original plate) counts (or count) as the work. And what is true of painting is true of the sketches that precede the painting. The sketch itself is a work of art, and one that is autographic, in spite of its being used as a guide to the production of the final work (Goodman 1976, 192–194).