evidence: Leonardo da Vinci was a man of enormous intellect and imagination that allowed him to create (at least on paper) inventions such as the bicycle, the helicopter, a submarine and an airplane, centuries before they would come to fruition. Sigmund Freud, an Austrian neurologist and the founder of psychoanalysis, stated that Leonardo da Vinci was "a man who awoke too early in the darkness, while others were all still asleep". Da Vinci is also known for his extensive interest in the interconnectedness of science, nature and art. This led him to the pioneering research in neuroanatomy, with some of the most accurate anatomical sketches of this period.