I am with these words of Pablo Neruda:
Where is the center of the sea?
Why do waves never go there?
Now, there's a koan to spin you in a frenzy especially if you feel it in your own body. Feel the waves, and the center. Where do the waves come from, link, go?
Here is some more Pablo Neruda to contemplate.
If all rivers are sweet,
where does the sea get its salt?
Where does the rainbow end,
in your soul or on the horizon?