Where should Tai Chi sword be hung in the building?

No, just don't hang it on the lintel and outside the balcony (kitchen and bathroom are not suitable either). No kidding, it really doesn't matter. Although there are many stresses on the concept of Feng Shui culture, I still believe in the theory of "believing is not believing". My Tai Chi sword has been kept in my bedroom, and my life is as healthy and safe as when I didn't buy it.