在中国传统风水学中, houses with mountains at the back are often considered to be auspicious. This is because mountains symbolize strength, stability, and support in Chinese culture, and they are believed to bring good luck, protection, and a sense of tranquility to those who live there.

Here are some points to consider:
1. **Back of the house with mountains:** If a house is built with a mountain at the back, it can create a natural barrier and be seen as providing protection from the "sick wind" (俗称“煞风”) and negative energies that could come from the direction of the house. Moreover, the presence of mountains can provide a sense of seclusion and privacy.
2. **Building a fence instead of a mountain:** If there is no mountain or if building a fence is necessary, it's important to consider the following:
- **Orientation:** Make sure the fence doesn't block the good energies from coming to the house.
- **Height:** A fence that is too tall can obstruct the flow of Qi (气) or life force, so a moderate height might be better.
- **Design:** The design of the fence should be harmonious with the surrounding environment and not look out of place.
It's essential to note that traditional风水 beliefs vary and are subjective, and modern architecture and building codes may not always align with these ancient practices. If you're considering these principles for your house, it might be wise to consult a qualified风水大师或者风水师, who can give you advice based on your specific location and circumstances. However, remember that the ultimate goal of any house design is to make you feel comfortable, safe, and happy in your living space.
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