"I would contrive catapults, mangonels, trabocchi, and other machines of marvellous efficacy and not in common use."

"And in short, according to the variety of cases, I can contrive various and endless means of offense and defense....  I can carry out sculpture in marble, bronze, or clay, and also I can do in painting whatever may be done, as well as any other, be he who he may."

From the cover letter of Leonardo da Vinci, age 30.