Most sea poems are about the sea. "Foam Phantom" is about a few seconds of light on a wharf and the years of darkness that follow them. A sailor strikes a match to shelter from a squall, glimpses a woman's face, is hustled back to his ship, and spends every night watch afterwards cursing himself for not staying. Nothing much happens, which is exactly the point: the poem tells us how little it takes to change a life, and how long a person can live with the thing he failed to do.
The construction is simple but quietly clever. The poem is built from six quatrains with a loose rhyme scheme, in which only the second and fourth lines chime: "squall" with "call," "face" with "grace," "wall" with "stall," "ship" with "dip," "leer" with "fear," "cool" with "fool." This half-rhyme pattern gives the poem the easy gait of a sailor's yarn, but it also lets the rhymes land with weight. Look at what they connect. "Squall" and "call" join the weather to the mysterious summons. "Leer" is tied to "fear," so the crew's crude gaze sits right beside the man's private anguish. The final rhyme, "cool" and "fool," delivers the poem's verdict in a single flat word, and the plainness of "fool" is more painful than any elaborate self-reproach would be. The rhythm is a loose, lilting beat of roughly four stresses a line, which sways like a deck underfoot and keeps the voice conversational.
The imagery is built around light and its failure. The first match is "feeble" and dies in the gust; the second "lit quickly and brightly burned." The whole encounter happens inside the lifespan of a match, which makes it brief by definition. Then the light shifts to the "lantern gleam" by which he sees the "filmy kerchief dip", a farewell that is also a fading, the word "filmy" suggesting something barely there. The title's "phantom" matters here. A phantom is something seen but not held, and "foam" adds the sea's own impermanence. Even the woman's appearance is carefully chosen: "damp copper curls," like "a bas-relief in a foreign stall." A bas-relief is a carving that never quite steps out from its background, and the comparison freezes her as an image rather than a person. She is "standing flat against the wall," pressed into the surface just like a carving. We never hear her speak; we are never told who she is. The speaker's own question, "Now where before had I seen that face?", hints at recognition, but the poem leaves it unanswered, and that gap is part of its power.
The language of impact is striking for such a small moment: "My world around me suddenly crashed," "My heartbeats quickened." These are big phrases attached to a glimpse, and they show a man overwhelmed by feeling he cannot explain. The poem's second half turns from the event to its aftermath. The crew "jostle and wonder and leer," three verbs that stack up like the noise of men who see only a changed mood and guess at a cheap reason for it. Against them stands the speaker's claim to "a strong man's soul / Filled with sedulous longing and fear." "Sedulous" is an unusual word, meaning persistent and diligent, and it turns longing into a kind of duty he performs nightly. Pairing longing with fear is honest, too: he is afraid of the feeling and perhaps of what answering it would have meant.
The ending is the most telling choice. Instead of a dramatic reversal, the poem closes on repetition: night after night on watch, the "pungent, stinging wind" and the same mental return to "a wharf and a fishing shed." The sting in the wind is echoed by the sting of memory. A watch is a time of enforced stillness and attention, so he has nowhere to put the thought except back into the same scene.
What makes the poem worth reading is its restraint. It does not claim the woman was his destiny; it only shows that the possibility was enough to haunt him. It is a poem about the roads not taken, told with a sailor's plain tongue.