The merit of painting lies in the exactness of reproduction. Painting is a science and all sciences are based on mathematics. No human inquiry can be a science unless it pursues its path through mathematical exposition and demonstration.
Leonardo da VinciIt vexes me greatly that having to earn my living has forced me to interrupt the work and to attend to small matters.
Leonardo da VinciThe first of all simple colours is White ... We shall set down White for the representative of light, without which no colour can be seen; Yellow for the earth; Green for water; Blue for air; Red for fire; and Black for total darkness.
Leonardo da Vinci