Of all the Nissan Z cars, arguably two endure the most today: the original 240Z, and the sleek and twin-turbocharged Z32 300ZX of the 1990s. And the designer of that car, Toshio Yamashita, wasn't just content to design rad cars back in the day. He's been helping teach the art of car design to the next generation, so he shared the fascinating process he uses to think about car design and brainstorm new cars.