Technical Illustrator Giorgio Piola on "The Most Important Drawing That I've Done in My Life"

Working designers among you: Somewhere in your archives, you probably have one drawing that's the most important one you've ever done in your life. Maybe it landed you a coveted job, provided evidence of a leap in skills or resulted in the best product you've ever worked on. Would you have trouble picking it out? For technical illustrator Giorgio Piola, whose career spans more than five decades, his answer is definitive. "The Lotus 72 sketch was the most important drawing that I've...