Internet art projects like adaweb or Textportrait are art projects for which the Net is both a sufficient and necessary condition of viewing / expressing / participating.
adaweb
adaweb.com is a research and development platform, a digital foundry, and a journey. 1994 in New York, John Borthwick und Benjamin Weil. Artists are invited to experiment with and reflect upon the web as a medium, and as a means of distribution for their work.