Artistic confidence is a valuable asset when it is warranted, but a terrible liability when not. Unfortunately, the nature of confidence is that it blinds us to whether it is warranted or not. Picasso's huge ego was an asset when it gave him the courage to break with stale traditions. On the other hand, Julien Schnabel's ego did him no favors when it led him to claim, "I'm the closest thing to Picasso that you'll see in this fucking life." Confidence can be the Jekyll or Hyde of art. Artist Markus Lüpertz certainly had the confidence to stand up to his critics. When he erected his latest public artwork -- a creepy, 60 foot sculpture of Hercules with one arm, a big nose, blue hair and a stunted body-- the New York Times reported: in the past his work has been, to put it kindly, misunderstood. One piece was smeared with paint and covered in feathers. Another was beaten with a hammer. Another was removed altogether after protesters demanded it be taken down. “It...