Three-sided spirit fortress design

Quick answer：

The three-sided spirit fortress design refers to the architectural design of a fortress that features three sides, typically with the fourth side being the natural or artificial barrier like a cliff or a body of water. This design is often found in ancient Chinese architecture, especially in defensive structures. It emphasizes symmetry, unity, and integration with the surrounding environment. The fortress usually incorporates elements like watchtowers, battlements, and moats for defense. The concept reflects the traditional Chinese philosophy of harmony and balance.