A swallow carrying mud is the image, and most mainland and Hong Kong temple books pair it with Dong Yong, the Han-dynasty model of filial devotion. Too poor to bury his father, he sold himself as a bonded laborer to raise the money. Moved by his devotion, a weaver maiden from heaven came down, married him, and wove silk through the nights until his debt was paid; then she went back to the sky, and the household she had helped him build came apart. That arc of hard labor, a home made and a home lost, matches the nest that crumbles and must be built again, and it explains the lower grade. Master Sean Chan's edition names a different story here, the warlord Dong Zhuo taking in Diaochan, another tale of effort that ends undone.