Why did Guo Moruo write the poem Market in the Sky?

During the period of 192 1~ 1922, China was in a chaotic period of northern warlords, and faced with the dark reality of semi-colonial and semi-feudal society, the author felt extremely angry. He linked the street lamps on the ground with the stars and street lamps in the sky, so he wrote an imaginative poem "Streets in the Sky".