“The very fact that a bird can get as far as building a nest, and cannot get any farther, proves that he has not a mind as man has a mind; it proves it more completely than if he built nothing at all. If he built nothing at all, he might possibly be a philosopher of the Quietist or Buddhist school, indifferent to all but the mind within. But when he builds as he does build and is satisfied and sings aloud with satisfaction, then we know there is really an invisible veil like a pane of glass between him and us, like the window on which a bird will beat in vain. But suppose our abstract onlooker saw one of the birds begin to build as men build. Suppose in an incredibly short space of time there were seven styles of architecture for one style of nest. Suppose the bird carefully selected forked twigs and pointed leaves to express the piercing piety of Gothic, but turned to broad foliage and black mud when he sought in a darker mood to call up the heavy columns of Bel and Ashtaroth; making his nest indeed one of the hanging gardens of Babylon. Suppose the bird made little clay statues of birds celebrated in letters or politics and stuck them up in front of the nest. Suppose that one bird out of a thousand birds began to do one of the thousand things that man bad already done even in the morning of the world; and we can be quite certain that the onlooker would not regard such a bird as a mere evolutionary variety of the other birds; he would regard it as a very fearful wild-fowl indeed.” —Chesterton