Audi Sport Quattro Concept

Whereas its other Frankfurt concept, the Nanuk, was almost cartoon-like in its pumped-up aggression, Audi’s Sport Quattro Concept was a handsome hooligan, the kind of thug who wears a sharply tailored suit to a fight. And despite evocations of the original Audi Quattro, a rally-racing pugilist that terrorised the European countryside 30 years ago, the concept neatly side-stepped easy retro-futurist clichés. (Photo: Stefan Bischoff)