in Thoreau’s Journal:  

A pleasant time to behold a small lake in the woods is in the intervals of a gentle rain-storm at this season, when the air and water are perfectly still, but the sky- still overcast; first, because the lake is very smooth at such a time, second, as the atmosphere is so shallow and contracted, being low-roofed with clouds, the lake as a lower heaven is much larger in proportion to it. With its glassy reflecting surface, it is somewhat more heavenly and more full of light than the regions of the air above it. There is a pleasing vista southward over and through a wide indentation in the hills which form its shore, where their opposite sides slope to each other so as to suggest a stream flowing from it in that direction through a wooded valley, toward some distant blue hills in Sudbury and Framingham, Goodman’s and Nobscot; that is, you look over and between the low near and green hills to the distant, which are tinged with blue, the heavenly color. Such is what is fair to mortal eyes. In the meanwhile the wood thrush sings in the woods around the lake.