Among the great things which are found among us the existence of Nothing is the greatest.
Leonardo da VinciThe variety of colour in objects cannot be discerned at a great distance, excepting in those parts which are directly lighted up by the solar rays.
Leonardo da VinciI have been impressed with the urgency of doing. Knowing is not enough; we must apply. Being willing is not enough; we must do.
Leonardo da VinciPeople reveal themselves completely only when they are thrown out of the customary conditions of their life.
Leonardo da Vinci