Among the instincts that we share with him are, as I have tried to show--first, an instinctive preference for order and arrangement; secondly, the need of balance and the pleasure we receive from it; thirdly, the increased pleasure we derive from balance, when it is accompanied with rhythmic repetitions. These are the principles on which he relies when he makes his composition. For let me repeat, and not for the last time, that the purpose of his composition is not only to suggest some scene of nature, but to make the composition itself a source of pleasure to our sense of sight.