This struggle between the reason and its ideas, and the senses, the desire of beauty, is the key to Leonardo's life at Milan -- his restlessness, his endless re-touchings, his odd experiments with colour. How much must he leave unfinished, how much recommence! His problem was the transmutation of ideas into images. What he had attained so far had been the mastery of that earlier Florentine style, with its naïve and limited sensuousness. Now he was to entertain in this narrow medium those divinations of a humanity too wide for it, that larger vision of the opening world, which is only not too much for the great, irregular art of Shakespeare; and everywhere the effort is visible in the work of his hands.