Leaves

"Hints of red are often found in green leaves. The color of a lilac leaf, held so that the sun glances from the surface, is full of sparkles of red. The under sides of leaves, as in the case of maple and elm and poplar leaves, often show a play of colors different from those of the upper surfaces."
~ Walter Sargent (1868-1927), The Enjoyment and Use of Color, Chapter 4: "Composite Colors"