The amazing, but temporary, art exhibits called “The Presidio Habitats”. It’s was an amazing number of installations that existed for a few years.
More here: http://www.presidio.gov/experiences/habitats/
The exhibit was through October 15 of 2011. Let this serve as a reminder of the great art that existed in the Presidio, and the great art yet to come. You can still see Andy Goldsworthy’s Spire and Wood Line. What urban setting has a national park that embraces naturalist art? I will tell you - absolutely nowhere else in the world.