in Thoreau’s Journal:

Think what a change, unperceived by many, has within a month come over the landscape!

Then the general, the universal, hue was green. Now see those brilliant scarlet and glowing yellow trees in the lowlands a mile off…See those crimson patches far away on the hillsides, like dense flocks of crimson sheep..See those patches of rich brown in the low grounds, where the ferns stand shriveled. See the greenish-yellow phalanxes of birches, and the crisped yellowish elm-tops here and there. We are not prepared to believe that the earth is now so parti-colored, and would present to a bird’s eye such distinct masses of bright yellow.