In a snowfall that covers the winter grass a white heron uses his own whiteness to disappear. - Dōgen

When you ride in a boat and watch the shore, you might assume that the shore is moving. But when you keep your eyes closely on the boat, you can see that the boat moves. Similarly, if you examine many things with a confused mind, you might suppose that your mind and nature are permanent. But when you practice intimately and return to where you are, it will be clear that there is nothing that has unchanging self.

What is the significance of this? It was simply a demonstration of Parental Mind. The Tathagata did not do this in expectation of some reward or fame. He did it unconditionally, without thought of profit or gain.

Our own picture of the world is a kind of a fantasy made of our memory in our brain. Each person has this limitation. That is why we have problems, troubles, fighting, arguments. The angles we see the world from are different, and anuttara samyak sambodhi, the supreme awareness, is to see that we cannot see the whole world, to understand that we are deluded and limited. This means we have to let go of our viewpoints.