Nobody invited the fly in Michael John Pickering's "A Floater", and nobody can make it leave. That small grievance, an uninvited guest who settles in and won't go, drives the whole poem. The twist is where the guest has settled: inside the speaker's own left eye. The word "sinistral" simply means left-sided, but it echoes "sinister", so a dry anatomical term picks up a faint menace. The title suggests the "fly" is really a floater, one of those drifting specks many people notice in their vision. The line "In bright illumination / they dance around" fits that, since such specks show up most against a bright background. The central idea is the helplessness of playing host to something you never asked for, told with mock-dignified irritation.
The construction is neat. The poem has fourteen lines and only two rhyme sounds, split evenly: seven lines end in the long "-eye" sound (fly, eye, why, die, try, I, fly) and seven in "-ation" (invitation, station, imagination, and so on). The two sounds keep returning, as the speck keeps drifting back into view, and the form behaves like the thing it describes. The opening lines also come back at the end. "A dirty little fly / without an invitation" becomes "who host a little fly / without an invitation." Line 14 is identical to line 2, so the poem can't get away from its own beginning. One word does drop out. The fly is no longer "dirty", and the verb "has taken up its station" gives way to "host". The poem suggests that the speaker's disgust is wearing down into resigned familiarity, though the complaint itself never changes.
The rhythm helps. The lines are short, mostly six or seven syllables, and the first one almost skips: "a DIRty LITtle FLY." That nursery-rhyme lightness is at odds with the irritation and keeps the tone comic. The punctuation adds to this. The speaker snaps out "I do not want it. Why?" and then, instead of explaining, answers with an exclamation: "Use your imagination!" The question and its answer pull the reader into the complaint, as if anyone should know how maddening this is.
The word choice carries much of the humour. The poem builds a vocabulary of hospitality and entertainment: "invitation", "host", "recreation", "commiseration". Against it stands one military-sounding word, "station", as if the fly had occupied a post. The fly turns into an unwanted performer who "dances" and tries "to serve as recreation", while the speaker is stuck in the audience and the host's chair at once. The long, formal words (illumination, recreation, commiseration) sit awkwardly beside the blunt monosyllables that carry the real facts: fly, eye, die, try. "Please grant commiseration / to victims such as I" is deliberately stuffy, a tiny plea in the language of a formal petition, and the fussy "such as I" (rather than "me") adds to the mock-solemn effect.
That "I" matters in another way. It is the poem's neatest sound-play: "eye" in line 4 and "I" in line 12 are the same sound, and they sit in the same rhyme position in their stanza-like groupings. The invasion of the eye becomes the invasion of the self, and the rhyme quietly joins the two.
The darkest moment is also the oddest: "They rot, but do not die." Two things happen here. The singular "it" has become a plural "they", so one pest has suddenly turned into a crowd. And "rot" and "die" bring in a faintly gothic note, like undead creatures drifting through the eye. The cheerful surface cracks for a moment, and what lies beneath is the real unease of a problem that doesn't go away.
The poem is significant for how much it makes from so little. A minor, private nuisance is given a tight, playful form, and the form acts out the problem it describes. Light verse like this can look like a throwaway, but here the humour is a way of coping. When a nuisance can't be fixed, the speaker can at least describe it with wit and some ceremony, and shape it into something that has an ending, even if the fly stays.