It's easy to point to examples when we construe art (as she does here) as including all forms of creative writing or storytelling. Just one example is work by many literary scholars on the 18th century novel as helping create a new sense of interiority and private life (i.e., reading a novel alone replaced gathering around a fire to hear a story). Or, going back much further, Alexander the Great's obsession with the Iliad would surely count as significant for world history.