Is it because pigments in the leaf (specifically chlorophyll) break down as the weather turns colder?
Is it part of a "bigger picture" of winter preparation for the tree or plant?
Is it a type of bug repellant from aphids that can only see in ultraviolet, blue, and green?
Whatever it is, I could look at fall-colored trees all day.
They are certainly striking this time of year ... Especially when set against a bright, blue sky.
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