What is the location of the volcanic steps? What grade?

It should be a fortune teller or something. In ancient times, there was a special divination institution for the royal family. Don't be too high-grade. Yuan Tiangang and Li are both such officials, and their tuibei pictures are very famous.

Well, ancient metaphysics and science are inseparable, just as western alchemists are also chemical scientists. It is said that the armillary sphere in Beijing was also designed by Li.