How does William Blake employ the words night and light contrast in the tyger and the chimney sweeper from songs of innocence?

In "The Tyger," William Blake uses the contrast between night and light to highlight the duality of nature and the eternal struggle between good and evil. The use of night conveys darkness and mystery, while light symbolizes knowledge and enlightenment. In contrast, "The Chimney Sweeper" from Songs of Innocence juxtaposes the innocence of a child against the grim reality of child labor, using light symbolically to represent hope and freedom, while night symbolizes oppression and despair.