When we climb a mountain, we often see many twigs supported under many semi-suspended stones, but we can't help thinking, how can such a fragile branch support a huge stone? I once met a ranger by chance. He told me that the branches they poked here only played the role of a logo. Every day, they will come to see the changes of these branches and judge the situation of the stones.
Because of the gravity of the earth, these semi-suspended stones are undergoing subtle changes every day. Sometimes, when the weather is bad, the wind and rain will also have some influence on the shape of the stones. And because of the movement of the earth's crust, the mountains change silently every day. These changes are unrecognizable to the naked eye, so we need some references to help people find these changes.
Although a boulder will not change its character in a short time, and there is no danger of slipping, when we climb the mountain, we should not stay under them for too long for shade or for the coolness under the stone, but try to pass as quickly as possible.
Another interesting phenomenon is that there are not so many branches under these stones, but many tourists will follow the trend when they see branches supporting here, for fear that the stones will fall.