Human subtlety will never devise an invention more beautiful, more simple or more direct than does nature because in her inventions nothing is lacking, and nothing is superfluous.
Leonardo da VinciThe part always has a tendency to reunite with its whole in order to escape from its imperfection.
Leonardo da VinciIt is a far worthier thing to read by the light of experience than to adorn oneself with the labors of others.
Leonardo da Vinci