knocked out and with a scarce intelligible incident of obsolete mythology portrayed upon it, has claims upon our feelings which the most useful modern mechanism ceases to have even in the intervals of its use, and which the newspaper, crammed full of the most important tidings, loses as soon as we have taken in its contents. CHAPTER XVII THE CO-OPERATION OF THINGS AND SHAPES DURING the Middle Ages and up to recent times the chief task of painting has been, ostensibly, the telling and re-telling of the same Scripture stories; and, incidentally, the telling them with the addition of constantly new items of information about _things:_ their volume, position, structure, locomotion, light and shade and interactions of texture and atmosphere; to which items must be added others of psychological or (pseudo)-historical kind, how it all came about, in what surroundings and dresses, and accompanied by what feelings. This task, official and unofficial, is in no way different from those fulfilled by the man of science and the practical man, both of whom are perpetually dealing with additional items of information. But mark the difference in the artist's way of accomplishing this task: a scientific fact is embodied in the progressive mass of knowledge, assimilated, corrected; a practical fact is taken in consideration, built upon; but the treatise, the newspaper or letter, once it has conveyed these facts, is forgotten or discarded. The work of art on the contrary is remembered and cherished; or at all events it is made with the intention of being remembered and cherished. In other words and as I shall never tire of repeating, the differentiating characteristic of art is that it makes _you think back to the shape_ once that shape has conveyed its message or done its business of calling your attention or exciting your emotions. And the first and foremost problem, for instance of painting, is that of preventing the beholder's eye from being carried, by lines of perspective, outside the frame and even persistently out of the centre of the picture; the sculptor (and this is the real reason of the sculptor Hildebrand's rules for plastic composition) obeying a similar necessity of keeping the beholder's eye upon the main masses of his statue, instead of diverting it, by projections at different distances, like the sticking out arms and hands of Roman figures. So much for the eye of the body: the beholder's curiosity must similarly not be carried outside the work of art by, for instance, an incomplete figure (legs without a body!) or an unfinished gesture, this being, it seems to roe, the only real reason against the representation of extremely rapid action and transitory positions. But when the task of conveying information implies that the beholder's thoughts be deliberately led from what is represented to what is not, then this centrifugal action is dealt with so as to produce a centripetal one back to the work of art: the painter