Owls hoot in B flat, cuckoos in D, but the water ousel sings in the voice of the stream. She builds her nest back of the waterfalls so the water is a lullaby to the little ones. Must be where they learn it.
Another way to look at meditation is to view the process of thinking itself as a waterfall, a continual cascading of thought. In cultivating mindfulness we are going beyond or behind our thinking, much the way you might find a vantagepoint in a cave or depression in a rock behind a waterfall. We still see and hear the water, but we are out of the torrent.