Answer:
I am the outstretched fingers that seize and hold the wind. Wisdom flows from me in other hands. Upon me are sweet dreams dreamt, my merest touch brings laughter.
Looks like water, but it's heat. Sits on sand, lays on concrete. A play on the eyes, but it's all lies.
What has to be broken before it can be used?
What always runs but never walks, often murmurs, never talks, has a bed but never sleeps, has a mouth but never eats?
Turns us on our backs, and open up our stomachs. You will be the wisest of men though at start a lummox.
You use it between your head and your toes, the more it works the thinner it grows.