Beautiful scenery in China Various, terraced fields reach the sky

Lee Hong Kwang of China talked about the terraced fields and said, "Plowing to the sky, you should know the poor". What does it mean that the terraced fields reach the sky? I was always thinking, but I could understand this landscape. If you saw this sight certainly it would be fine to think like that.

Details are as follows.
Impact Lab - Amazing Photos of China

Spring terraced rice fields and terraced fields (China Guizhou Province)

That said, I have not seen terraces recently, but still remain in Japan. It seems there was a preservation movement in the terraced paddy ....