Suppose we make believe that we are watching an artist as he begins his work of selection. The one over there, sitting under a big, white umbrella with his easel in front of him, will serve our turn. If he will let us look over his shoulder, we shall see that with a few strokes of charcoal upon his canvas he has already selected how much of the wide view in front of him he will include in his picture. It finishes, you see, on the right with a bit of that row of trees that stand against the sky, and on the left with that small bush, so that in between is a little bit of the winding road, with a meadow beyond dotted with cows. He has squeezed some of the paint from the tubes on to his palette, and takes up his brushes. Now watch him “lay in,” as he would say, “the local colors”; that is to say, the general color of each locality or part of the scene.