The new IndyCar IR-28 didn't come from nowhere. Paul Pfanner traces the forces that shaped it, and the cars that were drawn but never built, to show how the sport arrived here and the choice it faces next.

Paul Pfanner asks whether IndyCar has permanently turned its race car into standard equipment, what that trades away, and why the choice that builds what comes next has to be made now.

Paul Pfanner sets the reimagined IMS Museum against today's paddock and asks what the Indy car after the IR-28 should add to a century of cars that made change visible