 Previously, More had relied upon the Spirit of Nature as the supreme example of immaterial substance in the world, but of course, he could only insist upon the reality of this Spirit indirectly; arguing that it must exist to explain gravity, magnetism, generation, and other phenomena that presented real problems for the mechanical philosophy (Henry 1986, 1990). The advantage of using space to demonstrate the main features of immaterial substance was precisely because (at least, according to More, disregarding Aristotle, Descartes, and others) nobody could deny that space existed. The beauty, and the forcefulness, of using space as the exemplar of spirit is that its existence cannot be denied. It cannot be denied not just because everyone is aware of space by virtue of everyday experience, but also because, according to More, it is inconceivable that the world could exist without a space for it to occupy. “For we must either acknowledge”, More wrote, “that there is a certain extended [entity] besides matter, or that God could not create finite matter” (More 1671, 42).