Some poems announce their subject in the first line, but "Purple" makes you wait. The title is held back like the answer to a riddle, and the colour only arrives in the last two lines. Until then the poem builds a picture of absence: a speaker whose days are empty, whose nights refuse to let them sleep, and a "you" who somehow reaches both.
The first couplet is built on balance. "You fill the emptiness of my daylights / You sing lullabies to my sleepless nights" gives two lines of ten syllables each, both opening with "You" and a verb of giving, and tied together by the rhyme of "daylights" and "nights". The word "daylights" is slightly strange. We usually meet it in the idiom "scare the daylights out of", and the plural here stretches a single day into a long string of them, so the emptiness feels repeated rather than momentary. Day and night together cover the whole clock, which suggests that no hour is left without the beloved's help. The two verbs differ in tone, though. "Fill" is physical, like pouring something into a hollow container. "Sing lullabies" is tender and almost childlike, as if the speaker must be soothed the way a child is. That is quietly revealing about how helpless sleeplessness makes them feel. The speaker appears only through the possessive "my", attached to "daylights" and "nights", as though the self were defined entirely by what it lacks.
Then the poem changes gears. The second stanza drops to about seven syllables and then six, and the neat rhyme disappears. "Purple" and "blue" do not chime, and the poem moves from sound to colour at the very moment the pattern of sound breaks. The rhythm helps. "You are the ONly PURple" has a gentle falling rhythm, and "blue" lands as a single stressed syllable, like a door closing. There is no punctuation anywhere in the poem, so no full stop confirms the ending. It simply stops, the way a thought does when it has been said aloud.
The colour logic is where the poem is most interesting. Blue is the oldest shorthand for sadness, but the speaker widens it from a mood to a whole world: "everything is blue". Against that, "the only purple" does double work, since "only" means both the sole one and the unique one. Purple is also what you get by adding red to blue, so one reading is that the beloved belongs to the same world as the sadness but brings warmth into it. That is an inference, but the poem's own colour scheme invites it. Purple also carries cultural associations of richness and rarity, which may colour how we hear "only".
There is a smaller sound effect that rewards a second reading. "Blue" rhymes with "You", the word that began each of the earlier lines. If that is deliberate, the sadness and the beloved share a sound, and the "you" is hidden inside the blue it stands apart from. The poem never says so, but it lets us hear that the speaker cannot picture the sadness without picturing the person who answers it.
Nothing is known to me about the writer beyond the name given, so the poem has to stand on its own. The handle "monochromeIight" seems to join "monochrome" and "light", a one-colour world and the thing that breaks it. That is only a resonance, not a biography, but it fits the poem's central image closely.
The poem's significance lies in how much it does with so little. It takes the familiar phrase "feeling blue" and renews it by adding a second colour. It moves from abstract nouns ("emptiness") to a single concrete image, and it makes its argument through form as well as meaning. The rhyme and the long lines belong to the lonely world of the first stanza, and the colour arrives in short, unrhymed lines that feel like a breath of relief. For students, it shows how a turn in meaning can happen in just two lines, and how one well-chosen image can carry an entire feeling without explanation.