ON JANUARY 29, 2008, an e-mail began making the rounds of the art world. Originally sent by artist Nancy Holt to a small group of friends and colleagues, and rapidly forwarded on, the message contained an urgent appeal: Holt had been alerted, just the day before, to the existence of plans to drill for oil in the Great Salt Lake, near Robert Smithson’s Spiral Jetty, 1970, and she was asking people to contact the Utah state government to express their opposition before a rapidly approaching deadline for public comment.