GM's 'Autonomy' skateboard-like concept raised a few eyebrows at the NAIAS show in Detroit last month. But the thinking behind it is revolutionary and something like it could provide a platform for the fuel cell powered cars of the future. Autonomy reflects the fact that a fuel-cell stack can be made flat and thin; if form follows function in good design, then Autonomy could be a precursor to the vehicle platform of the future. It could also be the springboard for a lot of new ideas.