Just stumbled upon JR's video, he is a social artist from France. Yes, a "social artist". His project 28mm is an astounding collection of human emotions, portraits that were printed and displayed in the museum of streets. These subjects and their theme were for a social cause and were apt to the area it was shot. Photography & print were used as medium. He was also a speaker in TED 2011. His themes and the way he handled his subjects were inspiring. The video below is about his 28mm project.