Answer: Leonardo´s versatility is the best example of what we usually call "renaissance man". He excelled in many areas and did so well that he is frequently considered genius.
Explanation: There were other people like Leonardo, but Leonardo continues being famous. Versatility and genius where theory/experiment and practice meet, where fantasy/imagination and praxis and utility meet is the best reflexion of that time (renaissance). Psychologically speaking renaissance is considered a period or re-awakening, extroversion. People like Pico della Mirandola or Paracelsus still fascinate us.