Lalli Publisher Redefining the museum space and yield online and offline works of art on the net, in the appropriate spaces, is the theme of this agile essay briefly traces the history of net art. Between citations and references to the works and the events that have characterized it, the text frequently arises the crucial question of the immateriality of the works on the network, and their relationship still suffered a lot with contemporary art, based, however, on the market resulted from selling items, and still reluctant to accept the volatility of performance on the network. To give concrete answers to these unresolved questions there are eight interviews conducted by the author to as many curators who have somehow had to deal pragmatically with the dilemma. These include Jon Ippolito (Guggenheim), Christiane Paul (Whitney) and Mark Tribe (Rhizome) offering each a personal vision of the policies pursued, inevitably intertwined with the problem of preservation of digital works. This pair of themes (object value and conservation) represent a central point for the development of art in the network, and the text is one of the few writings on the subject.