It is interesting to note in what cycles this great wheel of circular observation revolves, directing the slow revolution of our gaze.
In one picture it takes us from the corner of the canvas to the extreme distance and thence in a circuit back; in another it moves on a flat plane like an ellipse in perspective. Again, first catching the eye in the centre, it unfolds like a spiral.
Much of a painter’s attention is given to keeping his edges so well guarded that the vision in its circuit may be kept within the canvas. A large proportion of the changes which all pictures pass through in process of construction is stimulated by this consideration—how to stop a wayward eye from getting too near the edge and escaping from the picture. When every practical device has been tried, as a last resource the centre may be strengthened.
In order to settle this point to the student’s satisfaction no better proof could be suggested than that he paint in black and white a simple landscape motif, with no attempt to create a focus, with no suppression of the corners and no circuit of objects—a landscape in which ground and sky shall equally divide the interest. He may produce a counterfeit of nature, but the result will rise no higher in the scale of art than a raw print from the unqualified negative in photography. The art begins _at_ that point, and consists in the production of unity, in the establishment of a focus, in the subordination of parts by the establishment of a scale of relative values, and in a continuity of progression from one part to another. The procedure will be somewhat as follows: Decision as to whether the sky or ground shall have right of way; the production of a centre and a suppression of contiguous parts; the feeling after lines which shall convey the eye away from the focal centre and lead it through the picture, a groping for an item, an accent, or something that shall attract the eye away from the corner or side of the picture, where, in following the leading lines, it may have been brought, and back toward the focus again. Here then, will have been described the circuit of which we speak. In the suppression of the corners the same instinct for the elliptical line has been followed, for the composition, by avoiding them, describes itself within the inner space.