Yuan Tiangang suddenly had a vision when he chose a cemetery. When he drops a copper coin, he will know the result. What does this mean?

When Yuan Tiangang was helping Wu Zetian choose a cemetery, suddenly there was a purple smoke rising from a place in the night sky, so Yuan Tiangang threw a copper coin as a mark, because he knew it was a treasure trove of geomantic omen, and the descendants buried here would be blessed. So after Yuan Tiangang went back to report to Wu Zetian, Wu Zetian let people build his mausoleum here, and this place is the future dry mausoleum. After that, many people wanted to go to the mausoleum to find out, but they couldn't get into the grave. So this place really has divine power to protect Ganling from being stolen.

When Wu Zetian became emperor, she never forgot that Li Zhi's last wish was to be buried back in Chang 'an, when Wu Zetian's capital was in Luoyang. So in order to choose a cemetery for Li, Wu Zetian recruited capable people, and Yuan Tiangang would do so, so Wu Zetian asked Yuan Tiangang to go to Chang 'an to choose a cemetery for Li Zhixuan.

Everyone knows that Yuan Tiangang knows Feng Shui, and he can do these things easily, so Yuan Tiangang went to Chang 'an, but he couldn't find a good place after searching for several months. At this time, he was staring blankly at the night sky. Unexpectedly, something magical happened. There is purple smoke above a mountain in the sky. He thought, this is purple gas from the east, which is a good sign, so he made a mark with copper money and reported it to Wu Zetian.

Later, Ganling was built in that place. After that, many people tried to go to Ganling for treasure, but there was no result. Grave robbers can't find the entrance to Ganling either. This story was spread by many ordinary people, so many people knew Yuan Tiangang's name and later stories.