Some of Chinatown's most vibrant and colorful graffiti can only be viewed from the pedestrian walkway on the south side of the Manhattan bridge. It is from that vantage point you can see where writers have taken advantage of building walls facing the bridge to talk to each other and passersby with a multitude of tags and fillins. You can view more photos on NYC The Blog's Facebook page.
Source : http://nyctheblog.blogspot.com/