At first glance I thought this Ghost Pontiac had just been dressed up in x-ray style decals, but I suppose the clue's in the name. Made in 1939 from plexiglass, it was the US' first transparent car.
Rinspeed's eXasis looks cool enough for us to forgive their horrid use of capitalization. The car is constructed from aluminum and plastic, and most of the control panel is touch sensitive. As I understand it, the use of clear, conductive Baytron allows the elimination of most simple wiring.