How many Feng Shui crystal beads should be hung?

Odd numbers are fine. Everything in the world has yin and yang. The extinction wavelength of yin and yang is caused by the interaction of five elements, but the odd number is yang and the even number is yin, so it is appropriate to use yang at home. How many pieces are suitable to hang depends on the actual aesthetics after hanging. What five elements do you like to use? In numerical mantissa, 1 is water, 3 is wood, 5 is earth, 7 is fire and 9 is gold.