Suppose you draw a line on a piece of paper. What is the result? The line has taken a certain direction, and it is of a certain kind. It is thick or thin, or it begins thin, grows thicker and then diminishes in width, or vice versa. It may be faint or distinct; firm or wavering, and so on. Which ever kind it is it will be so, either because you wished it to be of that kind, or because you couldn’t make it otherwise. In either case, it is you that have made the line what it is. If you have enough skill, you can make the line exactly what you wish.