Six lines are enough for Shelley to stage a small drama at a grave. A speaker looks up and sees an eagle circling over a tomb, and asks it where it is going. The eagle answers, and its answer is the whole poem: it is "the image of swift Plato's spirit, / Ascending heaven," while Athens is left to "inherit / His corpse below." The subtitle, "From the Greek," tells us this is a translation, so the thought belongs to an older tradition. What interests me is how it is shaped in English.
The central idea is a clean split between what a person is and what a person leaves behind. The body stays in the ground, claimed by a city, and the spirit goes upward. The eagle is a good emblem for that journey, since it is a bird of height and distance, and the poem lets its qualities spill onto the philosopher. The eagle isn't "swift" here, but Plato's spirit is. The adjective has been lent from bird to soul, as if the two were already merging.
The first question carries a lot of its meaning in its verbs and adjectives. "Soarest" suggests effort and muscle, a bird working against the air. By the next line the verb has become "Floatest," which is weightless and unhurried. Between the two, the flight turns from struggle into ease. The destination is "sublime and star-ypaven home." "Sublime" here keeps something of its older sense of lifted high. "Star-ypaven" is the most striking word in the poem. The old prefix *y-* marks a past participle, the same archaic habit Spenser liked, so the phrase means "paved with stars." Heaven becomes a street, and the word "home" makes it something the soul is returning to rather than merely visiting. The antique grammar gives the line a monumental, almost carved feel, which suits a poem that works like an epitaph.
The structure is a question followed by an answer, split cleanly in the middle. The first three lines address the eagle, and the dash after "Floatest thou?" leaves the question hanging for a moment before the reply begins. The shape is a tail-rhyme pattern, *aabccb*, with the two long lines of each half rhymed and a short line closing it. "Tomb" and "home" are an eye-rhyme, spelled alike but sounding different. Whether or not Shelley meant that to matter, the mismatch fits a poem about a place that looks like an ending and turns out to be a doorway. In the second half, "spirit" and "inherit" form a feminine rhyme with an unstressed second syllable, so the lines seem to trail upward and fade. The short third and sixth lines mirror each other, though "thou" and "below" chime only faintly. The meter is mostly iambic pentameter in the first two lines, loosened in the answer. Lines four and five each end with an extra soft syllable, which keeps the voice from sounding too tidy.
The last line gives the poem its sharpest effect. "Inherit" normally means to receive something valuable, and Athens does receive something, but only a "corpse," a harsh, blunt word that drops like a stone after the airy vocabulary of "soarest," "floatest" and "ascending." The poem has been rising for five lines, and it ends on "below," the one word that points down. The reader is left at ground level, looking up at where the eagle was, which is also where mourners at a real tomb would be standing. The word "image" is worth noticing too. It may only mean "likeness," but judging by the wording it could also suggest a sculpted eagle on the monument, speaking for the dead. The poem doesn't say, and that ambiguity adds to its charm.
The poem matters for its compression and for what it shows about translation. It gives a whole view of death in a handful of lines: grief for the body, confidence about the soul, and a quiet irony about what cities claim to own. It also shows that translating a short ancient poem is a craft of its own. Shelley turns the old thought into English with rhyme, archaic diction and a deliberate pause, and the result reads as a finished poem, not a literal crib. Few poems this short manage to move from a grave to the stars and back to the grave again.