Pleasure and pain, therefore, are not only necessary attendants of beauty and deformity, but constitute their very essence.

And indeed, if we consider, that a great part of the beauty, which we admire either in animals or in other objects, is derived from the idea of convenience and utility, we shall make no scruple to assent to this opinion.

That shape, which produces strength, is beautiful in one animal; and that which is a sign of agility in another.

The order and convenience of a palace are no less essential to its beauty, than its mere figure and appearance.

In like manner the rules of architecture require, that the top of a pillar should be more slender than its base, and that because such a figure conveys to us the idea of security, which is pleasant; whereas the contrary form gives us the apprehension of danger, which is uneasy.