If BMW had an auteur—the kind of auteur Apple had until last night—would his fans gather at local BMW dealerships when he died to light candles and toss flowers in front of showroom windows the way Steve Jobs fans are now at Apple Stores around the world? Would they storm Twitter to post recollections of the first and second BMWs they owned and thank Mr. BMW for having made their ordinary trips to the store for milk and eggs more like cosmic adventures in motoring?