Shelley opens with a city that has already died, and he packs its whole history into one line: it "was the cradle, and is now the grave / Of an extinguished people." The scene is a ruin, so desolate that Pity herself "weeps o'er the shipwrecks of Oblivion's wave." Here the city's past is a sea that has swallowed its ships, and the grief is for everything the water has erased. Into this emptiness he sets the Tower of Famine, built "upon some prison-homes" whose prisoners "rave / For bread, and gold, and blood." That list of three moves from need to greed to violence, as if hunger, once it goes unanswered, corrupts every other desire.
The poem's central idea is that famine does not only kill its victims. It also drains the meaning from everything around it. The tower stands "amid the towers / And sacred domes," yet the city's temples, "brazen-gated" and crowned with "marble-ribbed" roofs, are "by its presence dimmed." The "bowers / Of solitary wealth" and the "tempest-proof / Pavilions" are the buildings of the secure and the comfortable, and they "stand aloof, / And are withdrawn." Shelley's word "aloof" works two ways. It describes architecture shrinking back, and it hints at the moral distance of the rich and devout from suffering. The result is a world left "bare."
The most striking moment is the final simile, in which a "spectre wrapped in shapeless terror" glides among "a company of ladies fair." It does not attack them. It "glides and glows" until it becomes "a mirror / Of all their beauty," and their loveliness, "with all its error," is absorbed into it until "they to marble grew." The horror is quiet and almost seductive, a draining of life that happens while the victims are still admired. The word "error" is also puzzling, and the poem never explains it. Perhaps it means the faults and flightiness that belong to living beauty, so that being fixed in stone costs the ladies their humanity along with their flaws.
The word "marble" ties the poem together. It first appears in the city's roofs, and it returns at the last moment to describe the women. The buildings and the people end up the same, cold and polished and still. The fire imagery works in the same direction. The prisoners' lives are a "light flame" fed by "vital oil," which pain and guilt "agitate" until it is "spent or spilt." The two verbs differ slightly: "spent" suggests slow use, "spilt" sudden waste, and the line leaves open whether these lives are burned up or simply thrown away.
The form supports all this. Shelley writes in terza rima, the interlocking pattern (aba, bcb, cdc) that Dante used in the *Divine Comedy*, and the rhyme at the centre of each stanza becomes the outer rhyme of the next. "Wave" and "grave" reach forward into "built" and "Guilt," which in turn link to "spilt." The effect is of one link pulling the next along, much like an argument closing in. The lines are mostly iambic pentameter, but they are loose. "As if a spectre wrapped in shapeless terror" carries an extra unstressed syllable at its end, and the stress often falls oddly, so the verse seems to stumble in places. The long, sprawling sentences, with their dashes and interruptions, make the reader work through the description just as the eye must work through the city's crowded skyline.
The ending is where the poem's craft shows most. Instead of a neat final line, the last stanza adds a fourth line. "Terror" and "error" reach forward to "mirror," and then "hue" and "grew" close the sequence by rhyming only with each other. Nothing is left to carry the chain onward, and the poem halts on "marble grew," an image of life turned to stone.
That is what makes the poem worth reading. Shelley turns hunger into a haunting that spreads through a city's architecture and eventually into its people. The grandest buildings and the loveliest faces are not shown as safe from it. Instead they are shown as something it can feed on.