We were just sent an incredible TED talk with artist "JR". During his speech JR talks about his incredible art project that entailed traveling around the world, photographing locals with power stories, and then pasting their images on the sides and tops of buildings.
The video is long, and starts off a bit slow, but really is worth finishing. At the end of the video JR gives us all a call to action by taking part in his new project "Inside Out". Art is a powerful thing, and can easily change the world.