in Thoreau’s Journal:

Never is there so much light in the air as in one of these bright winter afternoons, when all the earth is covered with new-fallen snow and there is not a cloud in the sky. The sky is much the darkest side, like the bluish lining of an egg-shell. There seems nothing left to make night out of. With this white earth beneath and that spot[less] skimmed-milk sky above him, man is but a black speck inclosed in a white egg-shell.

Sometimes in our prosaic moods, life appears to us but a certain number more of days like those which we have lived, to be cheered not by more friends and friendship but probably fewer and less. As, perchance, we anticipate the end of this day before it is done, close the shutters, and with a cheerless resignation commence the barren evening whose fruitless end we clearly see, we despondingly think that all of life that is left is only this experience repeated a certain number of times. And so it would be, if it were not for the faculty of imagination.