This article is an important source bringing together the ideas we have been discussing in class about ownership, parody and the public domain.  It would be a very important source in discussing and interpreting the Koons v. Rogers case in more depth in terms of the public domain, the economic factors, and the First Ammendment Act.  The test for economic harm is whether the copy takes so much from the original that it "serves as a replacement for that original".  A photograph of String of Puppies in a gift store of an art gallery may very well do just that.  In other words people may be more incline to buy a postcard of the more famous artist, Koons' work, than from some less well-known artist, such as Rogers.