A critical analysis of a text requires one to study and interpret it in a compelling way. In this poem, the speaker, perhaps a kind of hermit who lives away from the world's prying eyes, is searching for food and, instead, finds "celestial food." By celestial food, we might assume that he or she refers to spiritual sustenance rather than physical, in the sign of a stormcock, a kind of bird, singing in the elder tree above the broken roof. The speaker marvels over the care taken in the bird's creation: its wings and beak and claws, its bright colors and tuneful notes, how "strongly used, how subtly made," each sinew and sequin feather. The speaker also wonders how the bird looks so well-fed in February, and he compares the creature to the angel Gabriel in his brightness.
Pitter uses an ababcc rhyme scheme, meaning that the first and third lines share an end rhyme (the final words in the lines rhyme), the second and fourth lines share an end rhyme, and the fifth and sixth lines of each stanza rhyme. This construction seems as careful and purposeful as the creation of the stormcock is described to be. The different repeated sounds all work together, producing something that is even rather song-like in its musicality.
Pitter also uses a number of revealing metaphors and similes to describe the stormcock and the effect it has on the speaker. It is an "unfailing chorister," a player of "bagpipes," "dressed / Like a rich merchant at a feast," and "As bright as Gabriel," the angel. The song seems so lusty and clear, and the bird itself is so lovely with his "Gold sequins" and "shower / Of silver, [that it is] like a brindled flower." It inspires the speaker to think of springtime, when life is less lean and food more plentiful, and it even feels like a holy presence in his life.