Isn't it fascinating that Autumn produces such warm colors just as the weather becomes colder? In fact, one of the major causes of the color change is the increasing number of hours each day when the temperature is cool, a phenomenon that comes with lengthening nights. Thus, warm colors are dependent on cooler nights.
To be more accurate, it is actually the combination of warm Indian summer days and increasing hours of nighttime cold that causes the leaves to change color. As always, yin and yang are co-dependent on one another. We might say, therefore, that heat is the warm aspect of cold, and cold is the cool aspect of warmth. How magical life in this world is!
Photos: (L) Aspen trees on Bierstadt Moraine; (Top Left) Various shades of aspen color; (Bottom Left) An aspen leaf is backlit by the evening sun; All three photos were taken at Rocky Mountain National Park on July 19-20, 2014
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