Banksy is a well known, elusive artist, known for his artistic pranks. He travels to random, well-known areas to display (basically vandalize) his art in grandiose fashions. For example, he would paint beautiful murals in areas without permission, but since they're so pretty, the owners of that wall would keep it. Another time he would place his painting inside museums with no one ever noticing -- this draws huge crowds to museums, which prompts museum managers to keep his painting on display and turn it into a special exhibit. In this particular exhibit, Banksy somehow got an elephant, painted it, and placed it in the "Barely Legal" (he definitely meant it) exhibition. The elephant was covered in safe face paint, but that still drew a great deal of anger from various groups of people. A couple days later, the elephant was washed at the last day.