What makes the Autonomy approach so intriguing is that it would allow drivers to own several car bodies for just one skateboard, then alter the layout and look of their vehicles according to the dictates of lifestyle or mood. (A reality that would also transform the marketplace: Would a GM skateboard accept only GM bodies, or also third-party hardware? GM envisions the skateboard forming the platform not just for a few car models, but for dozens of models globally, changing the economics of production.) Each body would snap on to the Autonomy base, and its interior technology-controls, power, heating, and cooling-would connect to the chassis through a docking port on the platform. A family might own a commuter sedan body and a sport or SUV body for weekends or vacations, then buy a specially configured body so that, for example, a newly disabled family member could roll a wheelchair directly into the driving position. A notion like this has implications for another great American institution, the two-car garage-or perhaps the bodies would be stored at depots for quick installation. Within a given car body there would also be flexibility: Passenger and even driver seat positions could be moved; a car could be turned into a mobile office, even a mobile bedroom. Some of this seems fanciful, but when you clear the decks above the skateboard, the possibilities are astounding.