Hansen derived it from the idiom Hehanjianghuai, Senluowanxiang
Hehanjianghuai is the collective name of the Yellow River, Hanshui River, Yangtze River and Huaihe River. A metaphor for being broad-minded.
Senluowanxiang refers to the various scenes listed in the sky and the earth. The description contains extremely rich content.
The message is broad-minded and rich in connotation.