Guerrilla Art is a collection of photographs taken over the past 10 years in San Francisco, California, North America. These are pictures of graffiti, murals, and other forms of free public art. Many, if not most of these works no longer exist. Most of the artists never got any money for their work. Important tip! (Veteran iPad users may already know this) For "Portrait View" galleries: 1. Tap photo to open gallery. 2. Rotate device. 3. When finished viewing, rotate device. 4. Close gallery.