I spoke of clay, and a gardener became angry with me. Garden soil, he said, is no clay; it is earth, humus, a useful and living substance; whereas clay, we all know, is dead matter, marl, slag itself. I was ashamed of myself somewhat; the gardener was right. Why, then, did the Lord create man out of clay and not out of soil? It is not written that Adam was made out of humus. It is not said that the Creator made him out of fine leaf mold. He carefully set the humus and leaf mold aside for the Garden of Eden. We gardeners, therefore, do not fritter away the best soil on doubtful pursuits.
--Karel Čapek, Philemon (4/5)
I had fun with "marl" and "slag." Also leaf mold. Mmmm, leaf mold.