To confine ourselves, however, as closely as we may to painting, and leaving aside for the present the question of colour, which, as I have already said, is, in Florentine art, of entirely subordinate importance, there were three directions in which painting as Pollaiuolo and Verrocchio found it had greatly to advance before it could attain its maximum of effectiveness: landscape, movement, and the nude. Giotto had attempted none of these.