Nobody in this poem says "I," yet the whole thing is a small confession. It has six lines and three couplets, and the speaker never steps forward. We get only an infinitive, "to walk up and down the hill," and a negative, "and not see." That bare grammar is the point. Walking the same slope again and again has worn away the walker's attention, and the poem is what remains once that is admitted.
The title does the quiet work. "Dulled" is a past participle, so something has been done to someone. The second line, "a dull place," blames the hill, but the title overrules it and moves the dullness from the landscape into the person looking at it. The hill hasn't changed. The eyes have. The poem becomes an argument with itself: first the lazy judgment, then the correction, which arrives in the shape of an animal.
The fox is the poem's only creature and its only colour word. After the plodding monosyllables of the opening, where "up and down the hill" has the rhythm of a footstep repeating, "the red fox" lands like a flare. Yet it appears only in the negative, because the speaker does "not see" it. The poem sees what the walker couldn't. By naming the animal that went unnoticed, it makes the fox more vivid for having been missed, as absence turned into image. The line break after "not see" helps. For a moment the sentence holds nothing at all, and then the fox arrives, too late for the walker and just in time for the reader.
Whether the fox was really there is left open. "Met" is past tense, so the speaker seems to be looking back, perhaps with later knowledge, perhaps only with a suspicion. Judging by the text, the fox may be a real animal, or it may stand for everything a tired mind passes over.
Then comes the last word, "incognito." It is the longest word in the poem, four syllables after lines of mostly one-syllable words, and it sits alone on its line. Its Latin root means "unknown," which fits a poem about failing to know what is in front of you. The grammar also lets it attach in two directions. It could describe the fox, whose russet coat might vanish in glare and reflection. Or it could describe "light and water" themselves, meeting in disguise, the shifting glitter that is hard to look at and easy to look through. Both readings work. The everyday sense of the word, a celebrity travelling unrecognised, gives the fox a faintly comic dignity, as if royalty had strolled past unnoticed. It also offers the walker a gentle excuse, since the fox was in disguise and nobody can be blamed for missing a disguise. The poem lets us notice that excuse without quite accepting it.
The form carries the same quiet self-awareness. There is no rhyme, no punctuation and no capital letters. The lowercase "to" at the start feels like walking in on a thought already under way, as though the routine has been going on forever. Without full stops the couplets lean on each other, and the thought never quite closes. The sound shifts too. "Dull place" is blunt and heavy, with its thudding d and l. "Where light and water met" is the most liquid line, full of w and l sounds, and it flows where the opening lines trudged. The poem moves from duty to wonder in its sound before the meaning gets there.
Its significance lies in how little it asks you to believe. It states no moral, and it never tells you to pay attention. It is short enough to read in a breath, and that brevity enacts its subject, because a glance is easy to miss. What stays with you is the unsettling thought that the ordinary route may be crossed by something wild and bright, and that the dullness we blame on a place may be something we carry ourselves. The poem leaves you wondering what you have walked past on your own hill.