 After opening discussions on the nature of metaphysics, on distinctions, and on the divisions of being, More argues that the proper subject of metaphysics is incorporeal being, or spiritual substance. Each of the next twenty chapters (Chapters 6–25) focus on a single “method of proving the existence of immaterial substance” (More 1671, 42). These are drawn from natural philosophy, rather than from metaphysics: “From gravity”, “From pneumatic experiments”, “From vortices and comets”, and so forth. The most significant addition to More’s earlier work appears in Chapter 8 where More uses his concept of space as the perfect example of immaterial spirit. He dismisses Aristotle’s and Descartes’s concepts of place before presenting his own views on a real, self-existing space in some detail. More’s concept will be familiar to modern readers who are acquainted with Newton’s notion of absolute space. It is essentially a three-dimensional Euclidean space which is infinite in extent, completely isomorphous, and void except where it is occupied by body. For More, however, it is also the best example of immaterial—and therefore spiritual—reality in the world. What makes it the best example for More is that it is completely undeniable. As one of the characters in More’s Divine Dialogues (1668) is made to say, referring to the scholastic tradition of calling the supposed infinite space beyond the sphere of the fixed stars, “imaginary space”: space is “so imaginary that it cannot be dis-imagined by human understanding” (More 1668, 54).