I've been reading a great deal this summer. Here's a definition from Jung. "A great work of art is like a dream; for all its apparent obviousness, it does not explain itself and is never unequivocal." I found it in a book on landscape photography. Also David Ward (the author of Landscape Within) says it isn't necessary, or evn advisable, to always put a person into your landscape. Thanks goodness! This is my aesthetic, too.