Looking back on the year in painting, which artist from the past do you think has the most influence on artists today? Is it Pollock or Warhol or Nauman? Perhaps it's the cragginess of Louise Bourgeois or the risky searingness of Marina Abramovic? Maybe, with all the lame jokes and visual puns that clog the art fairs these days, it could even be master funster Red Grooms? Nope, the big swinging dick of every studio is someone who is rarely mentioned, but who's pictorially replicated over and over, the Swiss rationalist Paul Klee.