Photo (c) 2008 by the Incorrigible Curmudgeon
The street memorial is a whimsically sad form of art which, if not unique to DC is certainly ubiquitous in DC.
Assembled in tribute to a recently deceased child who is just as likely to have been a hit-and-run victim as a victim of random street violence, these memorials usually consist of a photo, sometimes flowers, and stuffed animals tied or gaffer-taped to a lamp post. This one is on the corner of Sherman Avenue and Columbia Road, NW.
One of my students once did a photo essay on these types of memorials. I'm sure there's a coffee-table book in there somewhere for a photographer with the time and talent to more formally document this phenomenon.