" An inquiry which I once made into the psychology of the Indian sign language with a view to discovering a possible relation between it and Greek manual gesture as displayed in ancient graphic art, led to the conclusion that Indian rhythms arise rather in the centre of self-preservation than of self-consciousness. Which is only another way of saying that poetry is valued primarily by the aboriginal for the reaction it produces within himself rather than for any effect he is able to produce on others by means of it. "

― Carl Sandburg , The Path on the Rainbow: An Anthology of Songs and Chants from the Indians of North America