dear master lee, does it matter if sha qi is directed at the windows instead of the main door? if so, what about a ba gua or mirror to neutralise it? i'm not keen in the traditional geometric ba gua, can a normal circular mirror be used? does the size matter? last query, can i place the mirror, at the bottom of the window cos trying to hammer a nail above the window out of the eighth floor is ill-advised.thanks. regards stan