in Thoreau’s Journal:

Now the sun is low in the west the northeasterly water is of a peculiarly etherial light blue, more beautiful than the sky—and this broad water with innumerable bays & inlets running up into the land on either side—& often divided by bridge causeways—as if it were the very essence & richness of the heavens distilled and poured upon the earth, contrasting with the clean russet land—& the paler sky from which it has been subtracted—nothing can be more elysian. Is not the blue more etherial when the sun is at this angle— The river is but a long chain of flooded meadows—