In the Treatise of man, Descartes did not describe man, but a kind of conceptual models of man, namely creatures, created by God, which consist of two ingredients, a body and a soul. “These men will be composed, as we are, of a soul and a body. First I must describe the body on its own; then the soul, again on its own; and finally I must show how these two natures would have to be joined and united in order to constitute men who resemble us” (AT XI:119, CSM I:99). Unfortunately, Descartes did not fulfill all of these promises: he discussed only the body and said almost nothing about the soul and its interaction with the body.