The brilliant autumnal colors are red and yellow
and the various tints, hues, and shades of these.
Blue is reserved to be the color of the sky,
but yellow and red are the colors of the earth-flower.
Every fruit, on ripening, and just before its fall,
acquires a bright tint. So do the leaves; so does
the sky before the end of the day, and the year
near its setting.
~ Henry David Thoreau
Peak Colors by Murray Stewart