The first line is a confession, and it sits oddly under its title: "I do not yet understand the sea." An oceanologist is supposed to be someone who does understand it, or at least studies it for a living. The poem opens by undercutting that expectation. The small word "yet" matters most here. It turns ignorance into an unfinished project, so the speaker sounds less defeated than patient, still standing at the edge of something far larger than any title can claim.
Then the poem swerves. "A cunning fellow / can put on several faces" sounds like a remark about a person, a trickster from a folk tale who changes expression to suit the moment. The phrase "cunning fellow" has a slightly old-fashioned, conversational ring, as if someone were shaking their head over a neighbour. It is also possible, judging by the imagery, that the sea is the fellow in question. Calm, glassy, grey and furious are all different faces of the water, and the poem never tells us which reading to prefer. That ambiguity is part of its charm. The word "faces" also quietly connects to the cliff that appears at the end, since a cliff has a face too. Whether or not that was intended, the echo links the two bodies that meet in the last line.
The turn comes with "but," and the poem shifts from statement to question: "what world is this / without dissimulation / to meet a cliff and laugh?" The syntax is tricky. One reading is that the sea, unlike the cunning fellow, wears no mask. When a wave hits rock it does so openly, and the spray and the crash read as laughter. If so, the puzzle is that something so unconcealed should still be so hard to understand. A second reading is that the speaker is surprised by the world itself, a place where something can be entirely without pretence. People rarely meet that kind of honesty, and the speaker seems unsure how to respond to it. Either way, the question is left hanging, and the only question mark in the poem closes it.
The sound and shape of the poem support this. There is no rhyme, and the lines are short and uneven, so it reads as speech rather than song. The first line is nearly iambic, four beats in a plain, steady rhythm, like a calm statement of fact. After that the poem loosens. Lines two and three run on into each other, and the last three lines are a single sentence that tumbles down the page without a full stop until the end, which feels like a wave gathering toward the cliff. Line five is a single abstract phrase, "without dissimulation," and it stands out sharply. "Dissimulation" is a long, Latinate, almost bookish word surrounded by short plain ones such as "sea," "face," "cliff" and "laugh." It names exactly what the sea lacks and the human world has plenty of, and its hissing sounds echo through the poem ("sea," "faces," "this," "cliff"), a faint suggestion of surf.
The ending deserves attention. "Laugh" is a blunt one-syllable word and the only verb of real action in the poem. It makes the collision of water and rock sound playful rather than violent. The sea is not angry at the cliff, it is amused by it, and that surprising tone is the poem's most memorable image. It gives the sea a personality while keeping it fully mysterious.
The poem is significant for how much it does in six lines. It treats the limits of knowledge as something interesting rather than shameful. A scientist's title promises mastery, but the poem prefers honest bafflement, and in doing so it matches the very quality it admires in the sea. The speaker says plainly what he does not know, without disguise. The contrast between human masks and natural directness lets a small poem ask a large question: what would it mean to meet the world as openly as a wave meets a cliff? The poem does not answer, and that open ending is why it lingers after the last line.