Car: M3 GT2
Artist: Jeff Koons
Why it's cool: Koons has done everything from a Lady Gaga cover to this amazing yacht, and he's set all sorts of records for the value of art by a living artist. Still, he practically begged BMW for seven years before he got to do his own art car, so when they finally gave him one that would be competing at LeMans, he made it all about motion, in homage to Warhol's M1.
*The Robin Rhode Z4 is controversial, and some don't consider it one of BMW's art cars because the car itself wasn't painted. It's included here because it illustrates the use of a BMW in the making of an installation.
Aaron Miller is the Rides editor for Supercompressor. His old 325i would only be considered an art car by the visually impaired, though he does wash it at least once a year. If you follow him on Twitter, he'll keep you updated when he washes it next.