What is the meaning of oriole singing in the world of mortals?

The singing of orioles in the world of mortals is the lyrics of Li Xiaobei's song "The Painter of a Small Town", which expresses the author's expectation for life. He is willing to be a swaying aquatic plant in Jinghu Lake, far happier than being a person in the world of mortals, with no joys and sorrows, no sickness and death. The days are monotonous, but we can see the stories of gathering, parting and parting that happened to pedestrians, and we can also pick up their dreams of staying here. This sentence describes the carefree life at that time.