Wherein would consist the joys of hunting, shooting, fishing, and many other favourite diversions, without the frequent turns and difficulties, and disappointments, that are daily met with in the pursuit?—how joyless does the sportsman return when the hare has not had fair play? how lively, and in spirits, even when an old cunning one has baffled, and out-run the dogs!
This love of pursuit, merely as pursuit, is implanted in our natures, and design'd, no doubt, for necessary, and useful purposes. Animals have it evidently by instinct. The hound dislikes the game he so eagerly pursues; and even cats will risk the losing of their prey to chase it over again. It is a pleasing labour of the mind to solve the most difficult problems; allegories and riddles, trifling as they are, afford the mind amusement: and with what delight does it follow the well-connected thread of a play, or novel, which ever increases as the plot thickens, and ends most pleas'd, when that is most distinctly unravell'd?
The eye hath this sort of enjoyment in winding walks, and serpentine rivers, and all sorts of objects, whose forms, as we shall see hereafter, are composed principally of what, I call, the waving and serpentine lines.
Intricacy in form, therefore, I shall define to be that peculiarity in the lines, which compose it, that leads the eye a wanton kind of chace, and from the pleasure that gives the mind, intitles it to the name of beautiful: and it may be justly said, that the cause of the idea of grace more immediately resides in this principle, than in the other five, except variety; which indeed includes this, and all the others.
That this observation may appear to have a real foundation in nature, every help will be requir'd, which the reader himself can call to his assistance, as well as what will here be suggested to him.
To set this matter in somewhat a clearer light, the familiar instance of a common jack, with a circular fly, may serve our purpose better than a more elegant form: preparatory to which, let the figure [Fig. 14 T p. I] be consider'd, which represents the eye, at a common reading distance viewing a row of letters, but fix'd with most attention to the middle letter A.
Now as we read, a ray may be supposed to be drawn from the center of the eye to that letter it looks at first, and to move successively with it from letter to letter, the whole length of the line: but if the eye stops at any particular letter, A, to observe it more than the rest, these other letters will grow more and more imperfect to the sight, the farther they are situated on either side of A, as is express'd in the figure: and when we endeavour to see all the letters in a line equally perfect at one view, as it were, this imaginary ray must course it to and fro with great celerity. Thus though the eye, strictly speaking, can only pay due attention to these letters in succession, yet the amazing ease and swiftness, with which it performs this task, enables us to see considerable spaces with sufficient satisfaction at one sudden view.
Hence, we shall always suppose some such principal ray moving along with the eye, and tracing out the parts of every form, we mean to examine in the most perfect manner: and when we would follow with exactness the course any body takes, that is in motion, this ray is always to be supposed to move with the body.
In this manner of attending to forms, they will be found, whether at rest, or in motion, to give movement to this imaginary ray; or, more properly speaking, to the eye itself, affecting it thereby more or less pleasingly, according to their different shapes and motions. Thus, for example, in the instance of the jack, whether the eye (with this imaginary ray) moves slowly down the line, to which the weight is fix'd, or attends to the slow motion of the weight itself, the mind is equally fatigu'd: and whether it swiftly courses round the circular rim of the flyer, when the jack stands; or nimbly follows one point in its circularity whilst it is whirling about, we are almost equally made giddy by it. But our sensation differs much from either of these unpleasant ones, when we observe the curling worm, into which the worm-wheel is fixt [Fig. 15 L p. I]: for this is always pleasing, either at rest or in motion, and whether that motion is slow or quick.