Motion and force, agreeable in themselves, are also agreeable by their utility when employed as means to accomplish some beneficial end. Hence the superior beauty of some machines, where force and motion concur to perform the work of numberless hands. Hence the beautiful motions, firm and regular, of a horse trained for war. Every single step is the fittest that can be for obtaining the end proposed. But the grace of motion is visible chiefly in man, not only for the reasons mentioned, but also because every gesture is significant. The power however of agreeable motion is not a common talent. Every limb of the human body has a good and a bad, an agreeable and disagreeable action. Some motions are extremely graceful, others are plain and vulgar: some express dignity, others meanness. But the pleasure here, arising not singly from the beauty of motion, but from indicating character and sentiment, belongs to a different chapter[72]. I should conclude with the final cause of the relish we have for motion and force, were it not so evident as to require no explanation. We are placed here in such circumstances as to make industry essential to our well-being; for without industry the plainest necessaries of life are not to be obtained. When our situation therefore in this world requires activity and a constant exertion of motion and force, Providence indulgently provides for our welfare in making these agreeable to us. It would be a blunder in our nature, to make things disagreeable that we depend on for existence; and even to make them indifferent, would tend to make us relax greatly from that degree of activity which is indispensable. CHAP. VI. Novelty, and the unexpected appearance of objects.