in Thoreau’s Journal:
What is the relation between a bird and the ear that appreciates its melody, to whom, perchance, it is more charming and significant than to any one else? Certainly they are intimately related, and the one was made for the other. It is a natural fact. If I were to discover that a certain kind of stone by the pond shore was affected, say partially disintegrated by a particular natural sound, as of a bird or insect, I see that one could not be completely described without describing the other. I am that stone by the pond side.