Sometimes we see a beautiful human face, with almost perfect features. But behind that beautiful mask may be a very dull, uninteresting mind. If so, the expression of the face will be passive, the opposite, that is to say, to active. It will not leap from grave to gay; kindle, sparkle, grow tender, or angry and joyful by turns. It will be--“faultily faultless, icily regular, splendidly _null_”--no expression. And we may even tire of its beauty; while a face, less perfect in features, may win us more and more and hold our interest by the charm of its continually varying expression. The more we think of it, the more do we realise that beauty depends upon expression. It is the same with nature as with the human face. Its beauty is affected by expression and this is produced by the varieties in the lighted atmosphere.