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hout any artistic expression, the result is of little account as art, on the other hand, when truly artistic expression is clothed in representations that offend our ideas of physical truth, it is only the few who can forgive the offence for the sake of the genuine feeling they perceive behind it. Plate VI. STUDY IN NATURAL RED CHALK BY ALFRED STEPHENS From the collection of Charles Ricketts and Charles Shannon Plate VI. STUDY IN NATURAL RED CHALK BY ALFRED STEPHENS From the collection of Charles Ricketts and Charles Shannon How far the necessities of expression may be allowed to override the dictates of truth to physical structure in the appearance of objects will always be a much debated point. In the best drawing the departures from mechanical accuracy are so subtle that I have no doubt many will deny the existence of such a thing altogether. Good artists of strong natural inspiration and simple minds are often quite unconscious of doing anything when painting, but are all the same as mechanically accurate as possible. Yet however much it may be advisable to let yourself go in artistic work, during your academic training let your aim be a searching accuracy. 38 III VISION It is necessary to say something about Vision in the first place, if we are to have any grasp of the idea of form. An act of vision is not so simple a matter as the student who asked her master if she should "paint nature as she saw nature" would seem to have thought. And his answer, "Yes, madam, provided you don't see nature as you paint nature," expressed the first difficulty the student of painting has to face: the difficulty of learning to see. Let us roughly examine what we know of vision. Science tells us that all objects are made visible to us by means of light; and that white light, by which we see things in what may be called their normal aspect, is composed of all the colours of the solar spectrum, as may be seen in a rainbow; a phenomenon caused, as everybody knows, by the sun's rays being split up into their component parts. This light travels in straight lines and, striking objects before us, is reflected in all directions. Some of these rays passing through a point situated behind the lenses of the eye, strike the retina. The multiplication of these rays on the retina produces a picture of whatever is before the eye, such as can be seen on the ground glass at the back of a 39photographer's camera, or on the table of a camera obscura, both of which instruments are constructed roughly on the same principle as the human eye. These rays of light when reflected from an object, and again when passing through the atmosphere, undergo certain modifications. Should the object be a red one, the yellow, green, and blue rays, all, in fact, except the red rays, are absorbed by the object, while the red is allowed to escape. These red rays striking the retina produce certain effects which convey to our consciousness the sensation of red, and we say "That is a red object." But there may be particles of moisture or dust in the air that will modify the red rays so that by the time they reach the eye they may be somewhat different. This modification is naturally most effective when a large amount of atmosphere has to be passed through, and in things very distant the colour of the natural object is often entirely lost, to be replaced by atmospheric colours, as we see in distant mountains when the air is not perfectly clear. But we must not stray into the fascinating province of colour. What chiefly concerns us here is the fact that the pictures on our retinas are flat, of two dimensions, the same as the canvas on which we paint. If you examine these visual pictures without any prejudice, as one may with a camera obscura, you will see that they are composed of masses of colour in infinite variety and complexity, of different shapes and gradations, and with many varieties of edges; giving to the eye the illusion of nature with actual depths and distances, although one knows all the time that it is a flat table on which one is looking. Seeing then that our eyes have only flat pictures containing two-dimension information about the 40objective world, from whence is this knowledge of distance and the solidity of things? How do we see the third dimension, the depth and thickness, by means of flat pictures of two dimensions? The power to judge distance is due principally to our possessing two eyes situated in slightly different positions, from which we get two views of objects, and also to the power possessed by the eyes of focussing at different distances, others being out of focus for the time being. In a picture the eyes can only focus at one distance (the distance the eye is from the plane of the picture when you are looking at it), and this is one of the chief causes of the perennial difficulty in painting backgrounds. In nature they are out of focus when one is looking at an object, but in a painting the background is necessarily on the same focal plane as the object. Numerous are the devices resorted to by painters to overcome this difficulty, but they do not concern us here. The fact that we have two flat pictures on our two retinas to help us, and that we can focus at different planes, would not suffice to account for our knowledge of the solidity and shape of the objective world, were these senses not associated with another sense all important in ideas of form, the sense of touch. This sense is very highly developed in us, and the earlier period of our existence is largely given over to feeling for the objective world outside ourselves. Who has not watched the little baby hands feeling for everything within reach, and without its reach, for the matter of that; for the infant has no knowledge yet of what is and what is not within its reach. Who has not offered some bright object to a 41young child and watched its clumsy attempts to feel for it, almost as clumsy at first as if it were blind, as it has not yet learned to focus distances. And when he has at last got hold of it, how eagerly he feels it all over, looking intently at it all the time; thus learning early to associate the "feel of an object" with its appearance. In this way by degrees he acquires those ideas of roughness and smoothness, hardness and softness, solidity, &c., which later on he will be able to distinguish by vision alone, and without touching the object. Our survival depends so much on this sense of touch, that it is of the first importance to us. We must know whether the ground is hard enough for us to walk on, or whether there is a hole in front of us; and masses of colour rays striking the retina, which is what vision amounts to, will not of themselves tell us. But associated with the knowledge accumulated in our early years, by connecting touch with sight, we do know when certain combinations of colour rays strike the eye that there is a road for us to walk on, and that when certain other combinations occur there is a hole in front of us, or the edge of a precipice. And likewise with hardness and softness, the child who strikes his head against the bed-post is forcibly reminded by nature that such things are to be avoided, and feeling that it is hard and that hardness has a certain look, it avoids that kind of thing in the future. And when it strikes its head against the pillow, it learns the nature of softness, and associating this sensation with the appearance of the pillow, knows in future that when softness is observed it need not be avoided as hardness must be. 42Sight is therefore not a matter of the eye alone. A whole train of associations connected with the objective world is set going in the mind when rays of light strike the retina refracted from objects. And these associations vary enormously in quantity and value with different individuals; but the one we are here chiefly concerned with is this universal one of touch. Everybody "sees" the shape of an object, and "sees" whether it "looks" hard or soft, &c. Sees, in other words, the "feel" of it. If you are asked to think of an object, say a cone, it will not, I think, be the visual aspect that will occur to most people. They will think of a circular base from which a continuous side slopes up to a point situated above its centre, as one would feel it. The fact that in almost every visual aspect the base line is that of an ellipse, not a circle, comes as a surprise to people unaccustomed to drawing. But above these cruder instances, what a wealth of associations crowd in upon the mind, when a sight that moves one is observed. Put two men before a scene, one an ordinary person and the other a great poet, and ask them to describe what they see. Assuming them both to be possessed of a reasonable power honestly to express themselves, what a difference would there be in the value of their descriptions. Or take two painters both equally gifted in the power of expressing their visual perceptions, and put them before the scene to paint it. And assuming one to be a commonplace man and the other a great artist, what a difference will there be in their work. The commonplace painter will paint a commonplace picture, while the form and colour will be the means of stirring deep associations 43and feelings in the mind of the other, and will move him to paint the scene so that the same splendour of associations may be conveyed to the beholder. Plate VII. STUDY FOR THE FIGURE OF APOLLO IN THE PICTURE "APOLLO AND DAPHNE" In natural red chalk rubbed with finger; the high lights are picked out with rubber. Plate VII. STUDY FOR THE FIGURE OF APOLLO IN THE PICTURE "APOLLO AND DAPHNE" In natural red chalk rubbed with finger; the high lights are picked out with rubber. But to return to our infant mind. While the development of the perception of things has been going on, the purely visual side of the question, the observation of the picture on the reti