Why is the side door of ancestral temple an arch?

There are many possibilities for using arches on the side doors of ancestral temples. Here are some possible reasons:

1. Beauty: The arch has certain aesthetic value, which can increase the visual effect and attraction of the building. In ancient times, arches were regarded as decorative elements symbolizing wealth and status.

2. Structural stability: The arch structure has good stability under pressure. So in the past buildings, arches were often used to bear large loads, such as side doors and roofs.

3. Traditional custom: In ancient times, the arch was regarded as an auspicious and sacred element. Therefore, in ancestral temples and other religious or sacrificial places, it may be a practice to follow traditional customs to adopt memorial archways.

4. Regional characteristics: Arches are not common in ancient buildings in China, but are the characteristics of some areas. This may be related to the local architectural style, materials and technology.

5. Defensive function: In some areas, the arch also has a certain defensive function. Because the arch structure is strong and can withstand the impact of external forces, it may be used to strengthen the defense performance of buildings.

In a word, the reason why the side door of ancestral temple adopts arch may be the result of the interaction of many factors. In the actual situation, it may be necessary to analyze the historical background, geographical location and other factors of specific buildings.