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First, note what it doesn't do: it's never especially cute or twee, dripping into greeting card territory. Nor does it ever give you a single confusing image. There are visuals that have a riddling quality, e.g. dripping light. But you know what he means without mystery.

Second, there's a perfect play of language. Consider that when the robin chirps, his "three clear tones" are present in the words "three clear tones" all emphasized syllables.