Drawing of Air Screw
From the Super Mario Wiki
The Drawing of Air Screw is an item in the SNES and PC releases of Mario's Time Machine. It is a picture drawn by Leonardo da Vinci of what would now be called a helicopter, conceptualizing something beyond what was possible at the time. The drawing is given to Mario by one of Verrocchio's apprentices after he reads Leonardo's Notebook using Mona's Mirror. As the apprentice is unable to remember who created the Notebook's artwork, he gives the drawing to Mario so that Mario can find another example of the artist's work. Mario brings the drawing to an old man who was interested in seeing more work from Leonardo, who immediately recognizes the drawing as having been created by him. The old man gives Mario the Drawing of Ideal Man in exchange and keeps the Drawing of Air Screw for himself.