[j. d. worthington]

I'd agree that this is true with a great deal of "high fantasy", or for that matter, any well-written fantasy; but then, I'd also say it applies to other types of writing, as well. For example, many of the classics of the weird tale become richer on rereadings, as one experiences the subtleties and nuances, gets a more deeper understanding of the implications of what the writer is saying about the world (often making the "horror" more disturbing because of the questions the writer asks about the nature of reality and how much is simply our prejudices and preconceptions), and the complexities and ambiguities of meaning.

So I'm not sure it's by any means restricted to high fantasy, but can be said about any truly textured and well-wrought piece of writing in general....