“The concept of pure art — pure poetry, pure painting, and so on — is not entirely without meaning; but it refers to an aesthetic reality as difficult to define as it is to combat. In any case, even if a certain mixing of the arts remains possible, like the mixing of genres, it does not necessarily follow that they are all fortunate mixtures. There are fruitful cross-breedings which add to the qualities derived from the parents; there are attractive but barren hybrids and there are likewise hideous combinations that bring forth nothing but chimeras.”