Fib
Quick answer: The Fib is a six-line poem built on the Fibonacci sequence: 1, 1, 2, 3, 5, 8 syllables. Learn its 2006 origin, the rules, and how to write a good Fib.
In April 2006, a children's author and screenwriter named Gregory K. Pincus posted a small idea on his blog GottaBook: a six-line poem whose syllable counts follow the Fibonacci sequence, 1, 1, 2, 3, 5, 8. He called it the Fib, a pun on Fibonacci and on telling small untruths. The idea escaped immediately. Within weeks thousands of Fibs had been written across the internet, the New York Times covered the craze, and mathematicians and poets found themselves sharing a form.
The Fibonacci sequence, described by Leonardo of Pisa in his 1202 book Liber Abaci and known to Indian prosodists centuries earlier, generates each number by adding the two before it. That growth pattern turns up in sunflower spirals and pine cones, which gives the Fib its quiet charm: a poem shaped like the way things actually grow.
The rules of the Fib
A standard Fib has six lines and twenty syllables, counted as 1, 1, 2, 3, 5, 8. There is no rhyme requirement and no set subject, though the founding examples leaned toward wit, mathematics, and the writing life. Extensions are legal and popular: keep following the sequence and your seventh line takes 13 syllables, your eighth 21, at which point line breaks start groaning. Some poets write reverse Fibs, descending 8, 5, 3, 2, 1, 1, and butterfly Fibs that climb and then descend.
The two one-syllable opening lines are the form's signature difficulty: two consecutive lines of a single syllable each, which must feel purposeful rather than stammering.
Writing a Fib that grows
Treat the mathematics as a metaphor for accumulation. The strongest Fibs start with a seed, a single word, then let each line add mass the way the sequence adds numbers: idea plus idea makes a bigger idea. Try making lines one and two a pair of related monosyllables, such as a word and its echo, a cause and its effect. The three-syllable and five-syllable lines develop the situation, and the eight-syllable closer should bloom, delivering the thought the small lines were saving up for. Because the whole poem is twenty syllables, a Fib forgives no dead words; if 'the' can go, it goes.
What Fibs are good at, and the counting trap
Fibs suit wit, aphorism, science and nature subjects, and any idea that snowballs: rumours, appetites, debts, spring. Teachers love them because they smuggle mathematics into the poetry lesson and poetry into the maths lesson. The standard beginner failure is treating the count as the achievement, producing twenty correct syllables with nothing inside them. A Fib is still a poem; it needs an image, a turn, or a sting, usually in the final line. Write five Fibs in a sitting and keep the one whose last line you can quote from memory an hour later. Short forms like this also make good warm-up drills before writing a longer contest piece, the way scales precede a recital.
What poets can take from this
- Make the two opening monosyllables a deliberate pair, not throat-clearing.
- Let each line genuinely add to the thought, mirroring the sequence's growth.
- Save the poem's payoff for the eight-syllable final line.
- Cut articles and fillers ruthlessly; twenty syllables cannot carry passengers.
- Try a reverse Fib when your subject shrinks instead of grows.
- Count syllables aloud; 'poem' and 'hour' trip up silent counters.
Try it yourself
Write a Fib about something that doubles or multiplies when ignored: dishes, weeds, unread messages, small lies. Let the first two one-syllable lines be the moment of ignoring, and the eight-syllable line the moment of reckoning.
Questions
What is a Fib poem?
A Fib is a six-line poem whose lines contain 1, 1, 2, 3, 5, and 8 syllables, following the Fibonacci sequence. It was invented by Gregory K. Pincus on his blog in April 2006 and spread rapidly online.
Can a Fib have more than six lines?
Yes. Extended Fibs continue the Fibonacci sequence, so line seven has 13 syllables and line eight has 21. Reverse Fibs descend from 8 back to 1, and some poets combine both directions in one poem.
Does a Fib need to rhyme or be about maths?
Neither. The only rule is the syllable count. Many Fibs are about mathematics because the form invites it, but any subject works, and rhyme is entirely optional.
By the Writory editorial team, reviewed by working poets. Updated July 2026.
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