What is a central idea of "The Ornithopter"? Select the two correct answers. Responses The du ke was impressed with da Vinci's plans for the ornithopter. The du ke was impressed with da Vinci's plans for the ornithopter. Leonardo da Vinci worked on commission for wealthy men. Leonardo da Vinci worked on commission for wealthy men. The ornithopter was designed as man's first attempt at flight. The ornithopter was designed as man's first attempt at flight. Leonardo agreed to create weapons of war despite his principles.