What does it mean to put five stone balls at the door in Feng Shui? What's the role?

Five stone balls are placed at the door. According to Feng Shui, the circle is Tai Chi, which can melt everything and resolve all kinds of disasters. It also symbolizes the meaning of the five elements. There is also the symbolic significance of the threshold, which is used by the people to stop the outflow of wealth, meaning to gather wealth.

In fact, putting five balls at the door has an aesthetic and practical function besides geomantic omen. Realistically speaking, it has a certain range of traffic restrictions, such as restricting the passage of big cars or vehicles. From an aesthetic point of view, it is definitely much better than barbed wire and other tools.