Let’s get one thing clear. Is ‘The Spear,’ a picture by the South African artist Brett Murray representing South African President Jacob Zuma in heroic revolutionary pose — with his penis hanging out — good art? No. The pose is striking. But the black, red and yellow coloring is derivative, borrowed not only from the Soviets but also a thousand other, better current works — not least a 2008 TIME cover by Shepard Fairey of President Barack Obama. And the organ is incongruous: exposed in inept fashion and gratuitously painted.