Metal is a postive Yang element and commonly used to supress the negative earth "Qi" which brings about sickness and setbacks.
Choose a picture frams, candle holders and dinning ware made from silver or gold (in colors) and you can also consider bronze and copper sculptures in places that is lacking in metal elements.
Feng shui is about creating an environment that is balanced, harmonious and attractive. Therefore, you should avoid any sharp objects and any unattractive elements.
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Effective Feng Shui Tips