Thoreau writes in his journal:
No sun till setting. Another still, moist, overcast day, without sun, but all day a crescent of light, as if breaking away in the north. The waters smooth and full of reflections. A still cloudy day like this is perhaps the best to be on the water. To the clouds, perhaps, we owe both the stillness and the reflections, for the light is in great measure reflected from the water . . .