As of this year’s Geneva Motor Show, it’s been fifteen years exactly since Audi introduced one of its most crucial concept cars of recent memory. It indicated (reliably) the design direction that Audi was to take for the next ten years. It previewed a model that would cement Audi as a legitimate competitive piece of the German tripartite we so love to compare today. It paid tribute to a totem of the Auto Union Legend. It’s the Audi Nuvolari Quattro Concept.