Final answer:
The poem's lines represent nature's dominance over human constructs by illustrating snow covering a road, subtly asserting nature's ultimate power.
Step-by-step explanation:
The lines from "It Sifts from Leaden Sieves" develop the theme that nature has power over human efforts by symbolically showcasing how natural elements like snow cover the creations of man, such as roads. This suggests that, despite humanity's attempts to assert control, nature ultimately has the dominating force. The covering of 'the wrinkles of the road' by the 'alabaster wool' can be interpreted as nature's softening and eventual overcoming of the human-made environment. In broader literature, such themes are frequently explored, detailing how nature's power can overshadow human industry and progress, as seen in the collective text provided.