Most of the times i dont understand art, but this is something amazing.
I was having my daily dose of after hour Colbert Report when i found out about JR, a french graffity artist. He made a gorgeous yet impactful massive graffiti and art installation of human face in city walls. Watch his 2011 TED presentation, mind blowing. Personally i think this is one of the best TED talks ive ever watch.
My favorite moment is the two face same profession project. By putting huge posters of two face of Israel & Palestinians side by side in both cities (which he told in the video, most of the people cannot distinguish who is who), JR make us contemplate heavily on the notion that : we are not so different after all.
Check out also his interview with Stephen Colbert. It is blocked for non US viewer hence install ProxMate extensions in your chrome first.