Going Postal Postal stickers have long been a preferred substrate used by street artists to get up. Of course, because stickers from the US Postal Service, UPS, DHL and FEDEX are so readily available, so many of these stickers get lost in the fray. That"s where graffiti photography legend Martha Cooper comes in. Shooting the origins of hip-hop and graffiti cultures since the late 1970s in New York City, and la Full description