From Tao & Zen
What is non-self, Anatta (Pali)? It means impermanence. If things are impermanent, they don’t remain the same things forever. You of this moment are no longer you of a minute ago. There is no permanent entity within us, there is only a stream of being.
This is a very profound teaching of the Buddha. For instance, looking into a flower, you can see that the flower is made of many elements that we can call non-flower elements.
When you touch the flower, you touch the cloud. You cannot remove the cloud from the flower, because if you could remove the cloud from the flower, the flower would collapse right away.
You don’t have to be a poet in order to see a cloud floating in the flower, but you know very well that without the clouds there would be no rain and no water for the flower to grow.