It is, however, maintained that the continuous social changes which constitute the evolution of society, so far from being the result of the purpose of any individual or of any government, are frequently the very opposite of what was intended by the authors of the changes, and always are notoriously beyond our power to forecast. But the fact that my plans are modified or diverted by my successors or by my coadjutors does not prove that there was no purpose in my plans, or that there was none in the modifications introduced by my successors. And the total result of our united action and purposes may be something different from what any of us individually intended and yet express a common purpose, which is shown by the result to have been more or less present to all of us. A cathedral begun in the Norman style may have taken generations to build and may end in Gothic; and it will express the ideas common to the several builders, in much the same way that a composite photograph reproduces most distinctly the features in which all the persons photographed coincide, and other features more or less distinctly according to the extent to which they are shared in common by the different subjects. Or, to express the effect of the successive actions of succeeding generations, we may borrow an illustration from the game of chess. It is possible for five players to play, taking it in turns to move, so that every player makes one move out of five, and plays alternately for White and Black. The result, with good players, is a brilliant and well-developed game, which is not the game as purposed or intended by any one of the five players, but as continually modified and improved by each every time that he took it up. When, then, we reflect how many players in the game of life there are even in a small society, we can well understand that, though each has his own way of serving the common purpose, none can forecast the result.