All conditioned phenomena are like a dream, an illusion, a reflection, a shadow, or a flash of lightning, or a few drops on the morning grass. So, for example, by the time you see the flash of lightning, it’s already gone. In no time, it’s come from somewhere and it’s gone somewhere else. You see it, and it’s gone. Which is to say that the world is something that you can see and experience but you can’t obtain or possess it.