Introduction to One Thread Sky: There are two stone peaks in the Cangshan Stone Forest less than 1 meter apart. The gap is narrow and they stand leaning on each other. From a distance, they look like knives and axes chiseling. They are so miraculous that they are called "One Thread" by local residents. "Heaven" and "Auspicious Gate". It looks very narrow, but anyone who is fat or thin can pass through it. It is said that those who pass through this door will have good luck.