It is said of Frank Lloyd Wright that he was an unbelievably annoying and offensive man; worse than that, every home he ever built ended up with a leaky roof. More than eight years ago, the first major gathering of North American TT owners took place, not at a racetrack or in the banal confines of a convention-center parking lot, but in the shadow of Wright’s residential masterpiece, Fallingwater. It was an apt choice for an automobile which has chosen form over function since its introduction. Among the quartet of small German sportsters — Audi TT, Porsche Boxster, BMW Z, and Mercedes SLK — only the TT is a transverse-engined front-driver, only the TT is currently supplied in North America with a four-cylinder engine, and only the TT features rear seats, improbable as they may be. Those of us who remember the Sesame Street song “One of These Things Is Not Like The Other” will have no trouble picking out the Audi as the one which, indeed, is not like the others.