in Thoreau’s Journal:

A Thick fog. The trees & woods look well through it….

I remember now that the mist was much thicker over the pond than elsewhere— I could not distinguish a man there more than ten rods off—and the woods seen dimly across a bay were mistaken for the opposite side of the Pond— I could almost fancy a bay of an acre in extent the whole pond. Elsewhere methinks I could see twice as far— I felt the greater coolness of the air over the pond….