Earlier in this chapter (page 150) we said that if we want to understand how spirit moves, forms and transforms matter, we must recognize the existence of non-mechanical (magical) causes of physical effects. We have now found that the appearance of such effects in nature is due to the operations of a particular force, levity, polar to gravity. Observation of a number of natural happenings has helped us to become familiar in a preliminary way with the character of this force. Although these happenings were all physical in appearance, they showed certain definitely non-physical features, particularly through their peculiar relationship to three-dimensional space. More characteristics of this kind will appear in the following pages.