Where did the title Tiangong Kaiwu come from?

What do you mean by "excelling in nature"? The word "Tiangong" first appeared in the pre-Qin ancient book Shangshu. The word "Wu Kai" originated from another pre-Qin ancient book, Yijing Ci Shang. Tiangong refers to natural forces, and opening things refers to labor. In Song's view, the whole nature, including everything in the world, is formed by its own movement and change (so-called "Tiangong"). But "artificial" is often "ingenious" and there are many advanced inventions.