The Puyo is an environmentally friendly concept car designed by Honda. The vehicle is ultra-efficient, powered by hydrogen fuel cell technology, and has a unique aesthetic to boot. Literally. The sensual nature of this hydrogen fuel cell car also comes with a sense of transparency from its panoramic windows and intuitive operation. One of the coolest features of the Honda Puyo, however, is that the cabin rotates 360-degrees, so the car doesn’t have to go in reverse.