  Nevertheless, Ward’s theory does leave several questions open. In the first place, if our conscious apprehension of the external world is mediated by our direct apprehension of the monads constituting the body and more specifically the brain—as Ward contends (1911: 257–258)—why are we not aware of our neurons? Secondly, Ward’s theory escapes the composition-problem, but this is now replaced by the problem of monadic interaction. How does the dominant monad influence the lower ones and rule over them? Thirdly, there is a question as to the nature of space. Granted that direct monadic interaction is real, where does it occur? Interaction would seem to require a common dimension or medium in order to be possible at all; what kind of dimension could host spiritual beings such as the monads are supposed to be?