"On land off an ice covered sea the traveler can, for example, detect the presence of open water, simply because it reflects less light than land or ice. The open sea's telltale sign is thus a darkness on the underside of the clouds."

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The clouds that gather round the setting sun do take a sober colouring from an eye that hath kept watch o'er man's mortality; another race hath been, and other palms are won. Thanks to the human heart by which we live, thanks to its tenderness, its joys, and fears, to me the meanest flower that blows can give thoughts that do often lie too deep for tears.

— William Wordsworth