If often surprises people to learn that Leonardo da Vinci, the painter of the mysterious Mona Lisa and the great Last Supper, was equally interested in creating weapons of war. This is partly due to the fact that he quite often worked for men like Ludovico Sforza. Nevertheless, Leonardo took to such work with enthusiasm. Can you think what principles he might have invoked to justify his interest? Do you think that, if the chariot had been constructed and employed, audiences today would still view Leonardo as a great artist?