To introduce the ideas and imagination of an avant-garde artist such as Richard Kostelanetz, a link is provided here to a selection of his book A Dictionary of the Avant-Gardes from Google-books. The preface and introduction clarify and distinguish art that is avant-garde and what is not, but avoid conceptualizing, as difficult as that may seem, which would be misleading or contradictory.
Sorry, wordpress.com doesn’t allow embeds, I guess, so the link is it. You can go to tumblr and see it on page, same diff.
Individual entries on Richard Kostelanetz’s work in several fields appear in various editions of Wikipedia.