Imagine a wave. In the ocean. You can see it, you can measure it, its height, how the sunlight refracts as it passes through. And there it is. And you can see it, you know what it is. It's a wave. And then it hits the shore and disappears. But the water is still there. The wave was the water existing in a different way for a while. You know, for Buddhists it is a concept of death: the wave goes back to the ocean, back to where it came from and where it should be.