Andy Goldsworthy’s Tree Fall (2013) is an installation that presents visitors with a potent reminder of the relationship between the Presidio’s natural and built environments. Like Goldsworthy’s earlier Spire (2008) and Wood Line (2011), Tree Fall is constructed from a tree removed as part of the Presidio’s park management efforts; in this case, a eucalyptus felled for the Presidio Parkway project has been combined with clay derived from surrounding land. Installed inside the historic Powder Magazine on the Presidio’s Main Post, Tree Fall provides an unexpected perspective on the Presidio and its forest, bringing elements of the outdoors in and making visible what might otherwise be hidden underground.