A kind of spout sand refers to a big stone protruding from the spout. Xu Shanji's "Instructions of the Son of Man: Shafa": "Birds and stars are also stones in the mouth of the river, also known as falling into the river and Mars. ..... Where there is this strange stone town, it must be a big and expensive place between the water mouths and the rivers. " Feng shui experts believe that birds and stars are formed by the residual gas in real caves, which is a sign of gathering vitality and the basis of seeking expensive caves. In addition, the bird star, like other nozzle sands, has the function of closing the nozzle, which is inconvenient to be angry and untidy. Miao Xiyong's Burying Wings: "Luocheng is very angry, so go to the city gate, lock it heavily, wrap it carefully, or guard the door, stand out from the crowd, or set up a banner, or go out ..." Birds and stars represent glory. If you can pull up dozens of feet, such as bamboo shoots and phoenixes, it is better to show your feelings by acupoints, otherwise it will be unlucky. Huang Miaoying said in Boshan on the Sand: "It is true to care about me, but ask me behind my back."