On a hill near the southern border of the Presidio stands a sculpture by Andy Goldsworthy called Spire. It is about ninety feet tall, and can be seen reaching above the surrounding trees. It is a bundle of trunks from Monterey Cypress trees that reached the end of their lives.
Goldsworthy visited the Presidio in 2006 and found the forestry crew replacing cypress planted by the U. S. Army in the 1880s with seedlings. Struck by this moment, new trees replacing old, he created Spire to memorialize the old forest, which can be seen in the background.
In about ten years, the project will be complete. By then the newly planted trees in the foreground will have grown nearly as tall as Spire. This remnant of the old forest will disappear into the new one. It will become a secret sculpture, discoverable only by walking to it.
The spire Goldsworthy created will not change, but, since the growth of the seedlings was part of the concept, Spire is a kinetic sculpture. It's moving very slowly, but it is moving.