If everything is impermanent, then everything is what we call "empty," which means lacking in any lasting, stable, and inherent existence, and all things, when seen and understood in their true relation, are not independent but interdependent with all other things. The Buddha compared the universe to a vast net wovwn of a countless variety of brilliant jewels, each with a countless number of facets. Each jewel reflects in itself every other jewel in the net and is, in fact, one with every other jewel.
Think of a wave in the sea. Seen in one way, it seems to have a distinct identity, an end and a beginning, a birth and a death. Seen in another way, the wave itself doesn't really exist but is just the behaviour of water, "empty" of any separate identity but "full" of water. So when you really think about the wave, you come to realize that it is something made temporarily possible by wind and water, and is dependent on a set of constantly changing circumstances. You also realize that every wave is related to every other wave.
Sogyal Rinpoche, The Tibetan Book of Living and Dying