The origin of the "Striking Stone Yanming" in Jiayuguan Tower?

I’ve heard of this legend, but it’s been 6 or 7 years and I can’t remember it clearly. I just checked on the Internet, and it’s different from what I heard in Jiayuguan

According to legend, a long time ago, there lived a pair of beautiful and cute little swallows in Jiayuguan City. Their character was more beautiful than their appearance. Beautiful, they depend on each other for life, and their love is as deep as the sea. They are inseparable every day, foraging inside and outside Guancheng. In order to protect the people's crops, they constantly catch pests and silently do good deeds.

One day, there was a sudden strong wind and it was dark. The two swallows were lost and separated. The female swallow returned first. After waiting for several days, the male swallow did not return, and he also died after touching the city. Afterwards, the male swallows returned and found that the female swallows were dead. They were so sad that they also touched the city and died. Because their spirits did not leave, they vowed to continue to bless the people who came in and out of the pass, so that they could repair the afterlife and return to the human world.

Therefore, whenever people entering and exiting the pass leave Jiayuguan, they have to knock on the port to ask about their fate and ask about the good or bad luck after leaving the pass. When people hit the port, the two swallows send out the words "good luck", "good luck" and "good luck". The sound of Ji (good luck and good luck) comes to wish good luck to people entering and leaving the customs. Strangely enough, people who can hear the sounds of auspiciousness, auspiciousness, and auspiciousness can turn their misfortune into good fortune and return safely after leaving the customs.

Therefore, in the past, people named this city port "the wall to ask for life". Until now, there are still clear and visible traces of people knocking on the port to ask for life inside and outside Guancheng and at the corners of the city port.

After the founding of the People's Republic of China, in order to protect cultural relics, the masses were not allowed to stone the port to ask questions, but at the same time, they had to take into account the customs that had been passed down for hundreds of years. The staff of the Guancheng Cultural Relics Management Department changed the customs. , moved a stone to replace the "asking for life wall". Now when the two stones hit each other, they still make the sound of auspicious, auspicious, auspicious swallows. As time goes by, the "hitting the port to ask for fate" gradually evolved into "struck the stone with the sound of swallows".

This beautiful and moving legend of "The Swallow Strikes the Stone" has been circulated in Jiayuguan for hundreds of years and is still popular today. What is the reason for this? To put it bluntly, it is just a superstitious legend. The occurrence of this phenomenon is attributed to the clever builders and craftsmen in ancient my country. They built according to the principle that buildings can cause echoes and cries at long and short distances, which can produce Echo, this is the same as the echo wall in the Temple of Heaven in Beijing.