Bloomberg takes a look this week at the trend towards artists painting luxury automobiles, profiling specially commissioned projects by Frank Stella, Jeff Koons, and others, and investigating the economic versus aesthetic values that the work brings up.  “It’s not a given that because it’s a Calder or a Warhol car it’ll automatically get a huge premium — that has not been proven by the market,†says luxury auto insurance head McKeel Hagerty. “An art car raises more questions about the real value of the car than it answers.â€Read more at Bloomberg