It was one of those bitter mornings when the whole of nature is shiny, brittle, and hard, like crystal. The trees, decked out in frost, seem to have sweated ice; the earth resounds beneath one's feet; the tiniest sounds carry a long way in the dry air; the blue sky is bright as a mirror, and the sun moves through space in icy brilliance, casting on the frozen world rays which bestow no warmth upon anything.