Unfortunately, it seems to me that the claims of such things based on eastern mysticism (or any mysticism) are inherently so vague that it is difficult to ascribe any rigor to the testing. In fact the words mystic, mystical and mysticism share the same root origin as mystery. So as long as the precise cause of the results remains essentially a mystery, everything seems to work. Once you really start trying to define or test it, determining causal relationships, then it loses all of its mystical or mysterious powers. The negative flow of chi can (from my limited understanding ) counteract the positive flow, so by just questioning or doubting you set up such a negative chi field (as if one could actually apply vector fields to chi) that the results are inevitably doomed to be negative. The first requirement (as I understand it) is that you must believe in its effectiveness, after that it is all downhill from there. Also, it may not be just limited to you, your furniture or your beliefs (I’m just extrapolating here, you’ll have to ask someone with a degree in chi), your neighbors or neighborhood could be so un-feng shui and full of such doubts that their combined negative chi projects so much that it always cancels out your best efforts to establish a positive chi flow. As a consequence, negative results never mean a lack of applicability, while positive results can only come from the proper and perhaps temporary flow of positive chi. These remarks are just my opinions based on my limited understanding, as I have done no extensive research on the subject.