Picture a wave in the ocean, you can see it... measure its height, see the light shining off of it, it's there. But then it crashes on the shore and it's gone, but the water is still there. The wave is just a different way of the water to be for a little while, but the wave returns to the ocean, where it came from where it's suppose to be.
https://www.youtube.com/watch?v=l1IchzbtNj0
