Select two images from the poem "Falling Songs" by Daniel David Moses. Discuss the effectiveness of each image and how, together, they relate to the theme of the poem.

The main theme in this poem is the conflict between man-made cities and the natural world, the latter being represented by the migrating geese. The speaker of the poem tries to watch the migration through his "sooty window pane," but his view is obscured and he is left with only "a window shade dull sky" and "a hollow city."
Two key images in the poem are the simile comparing the "honking" of the geese to "bells that celebrate" and the aforementioned image of "a hollow city." The first image connotes the importance and also the joy which the speaker ascribes to the migrating geese. The second image, by contrast, implies the speaker's view that the city he lives in is without meaning or substance. It is not important or joyful, like the sight and the sounds of the migrating geese, but is rather, metaphorically, empty or "hollow."
The juxtaposition of these two images neatly captures the conflict in the poem and in the speaker. The speaker longs to escape the dirty, "hollow," meaningless city and instead wants to live in the natural world.