Dust

At the market, the dustman is selling sacks of dust. He is doing quite well out of it too. Who on earth would want to buy dust, you ask? Why, a man in a suit, of course. Here he comes, and he's going to buy an awful lot of it too. (The dustman is very happy about that.)
The man in the suit has the dust delivered to his factory, where he uses it to make a whole heap of people.
You were made from dust, and one day you'll be dust again. So respect the dust. (You probably also contain a fair bit of lint and carpet fluff.)