Lost Culture

It's an artwork for GGAC competition.
Link: https://www.ggac.net/m/work/detail/11968
In the seventh century AD, Tang Xuanzhao returned from the westward journey of Tianzhu, and saw Loulan became an empty city. 
It has been said that the ending of Loulan was caused by human beings who violated the laws of nature. After nearly 500 years of glory on the Silk Road, this important town was finally quietly disappear on the stage of history. 
But are they really gone? 
History does not record, pass the nameless, suddenly disappeared, is it really destroyed? 
In the strong wind, can Xuanzang really see the truth? 
Maybe at the moment when he closes his eyes, the road under his feet turns green.