Objects trouvé - The street as art

I am looking for a name for objects, phenomena / still lifes in the public space that look like art, but are actualy a result of real life happenings. The term also need to include the special framing that is achieved by photographing these phenomena, and talking about them as street art

This red cross is in the 8th district, it says above "Dr. True". I wonder what is the story of it.