 A second worry that follows from Hobbes’ view that we have only mediated access to bodies in the world relates to the possibility of gaining knowledge of the causes of natural events. Most of the ideas that knowers possess of bodies are received passively. When interested in the cause of some phenomenon, all one may examine are ideas caused by the motions of the bodies involved. However, when interested in, say, the cause of billiard ball B being put into motion after apparent contact with moving billiard ball A, one does not find an idea of A being the cause of B’s motion. Even if one were to look to a lower ‘level’, as it were, smaller than billiard balls by use of a microscope, one would not find any idea of A’s motion causing B’s motion. Hobbes diagnosed this lack of causal knowledge by highlighting that human agents are not the makers of natural phenomena. He seemed to think that makers gain this causal knowledge by attending to their constructions through the process of creating. Since we lack the ideas of the causes of individual phenomena from our experience, Hobbes claimed that we cannot know their actual causes at all. All that we may know are possible causes. Hobbes asserted in Six Lessons to the Professors of Mathematiques (1656) that because “of natural bodies we know not the construction but seek it from the effects” we can know “only of what [the causes] may be” (EW VII.184).