From Under The Glacier by Halldór Laxness:
It’s strange that all birds don’t fly in the same way. After all, the air’s just the same at the same place and the same time. I’ve heard that the wings of aeroplanes all conform to the same formula, whereas birds each conform to a formula of their own. It has undeniably required more than a little ingenuity to equip so many birds each with their own formula, and no expense spared, either. Nevertheless, there has perhaps never been a bird that flies as correctly as an aeroplane; yet all birds fly better than aeroplanes if they can fly at all. All birds are perhaps a little wrong, because an absolute once-and-for-all formula for a bird has never been found, just as all novels are bad because the correct formula for a novel has never been found.