For Knight "picturesque" means simply "after the manner of painting", a point which is important to his further discussion of sensation, which in Knight's view is central to the understanding of painting and music which are "addressed to the organs of sight and hearing", while poetry and sculpture appeal "entirely to the imagination and passions." The latter must be understood in terms of associations of ideas, while the former rely on the "irritation" or friction of sensitive parts of the body. Knight's view was that artists should seek to reproduce primal visual sensations, not the mental interpretative processes which give rise to abstract ideas.