works of art are “supremely real” whereas the physical world is “unreal.”

 It would be quite misleading to give the impression that all of those philosophers who thought minds and their activities have something to do with the existence of works of art also thought that this means that works were somehow less real than, say, natural physical entities and events. Idealists invert this hierarchy. 

This is explicit in Benedetto Croce (1913, 1965, 9–10) when he asserts that works of art cannot be physical entities because works of art are “supremely real” whereas the physical world is “unreal.”