The freezing of running water is another mystery. The strong white stuff, whose power I have felt in swollen streams, which I have watched pour over ledges in endless ease, is itself held and punished. But the struggle between frost and the force in running water is not quickly over. The battle fluctuates, and at the point of fluctuation between the motion in water and the immobility of frost, strange and beautiful forms are evolved. Until I spent a whole midwinter day wandering from one burn to another watching them, I had no idea how many fantastic shapes the freezing of running water took. In each whorl and spike one catches the moment of equilibrium between two elemental forces. (The Living Mountain)