What kind of book is Lu Ban Jing? Why was it listed as a banned book in previous dynasties? What's the mystery?

Lu Ban Jing is a professional book about civil engineering and architecture. It's a book about ancient architecture and machinery manufacturing in China, but it talks about many strange Daoism and medical skills. Lu Ban, a native of Lu in the Spring and Autumn Period, made inventions in many fields. He was born into a carpenter family. In his observation, he found many civil engineering tools. Not only that, he also made achievements in architecture, medicine, and even Taoism and magic. Became a banned book, mainly because the emperor hated winning since ancient times. After the founding of New China, books such as superstition were forbidden.

It is said that this book is divided into three volumes. The first volume mainly talks about the building methods and the production and use of building tools, and there is nothing inappropriate. The second volume is mainly about Taoism and incantations. The third volume is about the geomantic problem of building houses.

Legend has it that Lu Ban was newly married. When he was working outside, he missed his pregnant wife very much, so he cast a spell and rode a wooden kite home. His wife was curious, so she rode a wooden kite. Because my wife flew for the first time and was pregnant, she suddenly gave birth to a child on a wooden kite. The wooden kite was polluted by blood, and the magic disappeared at once. She fell to the ground and died two lives. Lu Ban wrote a curse in the book. More reliably, Lu Ban was not the only one who wrote the Classic of Lu Ban. The book summarizes the practical experience of craftsmen from Luban to Warring States, Qin and Han Dynasties, Wei, Jin and Southern and Northern Dynasties in the Spring and Autumn Period. This is not only a classic of carpentry, but also a classic of traditional architecture and architectural culture.

In ancient China, there were few books about architecture. Generally, Lu Ban Sutra was handed down orally by craftsmen, and the craft handed down by ancient carpenters was to respect Lu Ban as the founder. In the Qing Dynasty, new textbooks of Lu Ban Jing emerged one after another. During this period, various new and abridged versions were added. The legend of Lu Ban Jing began in the Qing Dynasty and spread among the people.