Three lines are all that survive of this fragment, but they hold a complete little drama: a speaker calls on an unseen force and asks it to move. The force is Zephyr, the west wind of Greek myth, and the speaker's plea is that it should "awaken" something inside a person. The central idea is that inspiration, or a stirring of feeling, arrives from somewhere we cannot locate, and that the inner life needs an outside breath to set it moving.
The key image is the "spirit's ocean." Shelley turns the mind or soul into a sea, which makes it vast, deep and hard to measure. An ocean is also something a wind acts on. If Zephyr is the "awakener," the sea must be asleep, so the spirit is pictured as full of potential but lying still until something touches it. The word "spirit" does extra work here. It comes from the Latin *spiritus*, meaning breath, so the line quietly joins the thing being stirred (the spirit) with the thing doing the stirring (the breath of wind). Even in a single phrase, the inner and outer worlds seem made of the same stuff.
The second line pushes against any attempt to pin the wind down. Zephyr is someone "whom to thy cloud or cave / No thought can trace." Unscrambled, the sentence means that no thought can follow him back to his cloud or cave. The inverted word order makes us wait for the verb, which mimics the difficulty of tracking him. "Cloud" and "cave" mark opposite ends of the world, high and open against low and hidden, so the speaker is saying the wind's source could be anywhere. The pairing also shows how the wind slips out of explanation. We feel its effects but never see where it begins.
The sound of the lines is carefully handled. The rhyme is "ocean" with "motion," a feminine rhyme in which both words end on a soft, unstressed syllable. That gentle landing suits a poem about a gentle wind. The middle line, "cave," rhymes with neither of its neighbours, so the three lines form an *aba* pattern. That is the shape of an opening tercet in terza rima, the interlocking form Shelley used in "Ode to the West Wind." We cannot know where this fragment was headed, and it may be only an inference that it was meant to continue that way, but the pattern is suggestive. As it stands, the unrhymed "cave" hangs unresolved, as though waiting for a following line to answer it.
The rhythm is loose. The first and third lines run long, to about eleven or twelve syllables depending on how you pronounce "awakener," while the middle line is shorter, at eight. The first line also has a drawn-out feel, because "awakener" takes four syllables to say, like a slow stretch on waking. The short middle line then tightens, as if the speaker catches a breath on the mystery of the wind's origin, before the final line opens out again. Heavy stops add urgency. "No thought can trace!" ends on an exclamation mark, and so does the closing line, which makes the whole fragment sound like a spoken invocation.
That invocation is built on apostrophe, the device of speaking directly to something that cannot answer. "Come" and "speed" are both commands, yet the final request is for a "gentle motion." This is the poem's quiet paradox. The speaker wants an awakening, but a soft one, a ripple across a great expanse of water rather than a storm. Gentleness and power sit side by side, and "gentle" itself, with its soft *g* and slow vowels, delivers the very calm it asks for.
The fragment is significant because it condenses an idea that runs through Romantic poetry: that creative energy and deep feeling come as visitations rather than as things we simply decide to have. It also shows how much can be packed into very few words. In three lines we get a myth, a metaphor, a paradox and a small piece of sound-craft. The abrupt ending adds to this, because the wind has been called and the poem stops before we learn whether it arrives.