Ogden Nicholas Rood (3 February 1831 Danbury, Connecticut – 12 November 1902 Manhattan) was an American physicist best known for his work in color theory.
The advance from drawing to painting should be gradual , and no serious attempts in colour should be made until the student has obtained proficiency in outline and in light and shade. If the artist cannot draws objects in a rather masterly way there is no point in his attempting colour.