Can you remember a time when you looked up at the sky, a blue sky with distinct white clouds in it, and as you looked at one particular cloud you could watch its shape constantly changing? You probably noticed how the cloud would thin out at the edges and, in many cases, especially with the smaller clouds, you could watch as it gradually disappeared.
If you can’t remember ever doing that, then do it as soon as the weather allows. Pick out a fairly small cloud and watch it constantly change shape, constantly thin out at its edges and gradually disappear.
Where does the cloud go?
The cloud doesn’t disappear. It becomes the sky as the sky flows through it.
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Heroes Not Zombies 
I think one of the things we should never grow out of is gazing up at the clouds and finding them out!