There is a picture with only the sky and wasteland as far as the eye can see, and an idiom with an old dead tree bark.

天黄地老tiān huāng dì lǎo

[Explanation] It refers to an extremely long time.

[Quotation] Tang Dynasty Li He's "Zhijiu Xing": "I heard that Ma Zhou was a new guest in the past, and no one knew him."

[Similar meaning]

[Usage] United form; used as an adverbial; refers to an extremely long time experienced