On the eighth floor of the treasury, Lu Yun’s cheek spasmed when he heard Su He’s muttering. The little girl had quite an imagination! He put it out of his mind and was quickly entranced by the world on this floor.

An enormous herb garden in a lush, green landscape thriving with life met his eyes. Birdsong filled the air and flowers waved in the breeze. An endless expanse of plants came into view no matter which direction he turned in.

This herb garden was quite different from other ones he’d seen before. The usual gardens of other locales were man made, enormous fields in which everything was laid out according to various categories.

The garden on the eighth floor of the treasury retained...