What does the empty mountain mean in "There seems to be no one on the empty mountain"?

Chai Lu's first sentence "There seems to be no one on the empty mountain" first describes the empty mountain "There seems to be no one on the empty mountain" in a positive way, but the focus is on the expression of the empty mountain. Because of the empty mountain, the non-vacuum mountain appears empty in the poet's feeling, just like the ancient earth. "No one is seen" embodies the meaning of "empty mountain".