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No governing body requires 5-7-5 in English. Classical Japanese haiku are written in a 5-7-5 pattern of sound units called on, and mid-twentieth-century English textbooks and translations, notably Harold G. Henderson's An Introduction to Haiku (1958), carried that arithmetic straight into American classrooms. The Haiku Society of America first adopted definitions in 1973 and has revised them since, most recently in 2026; the current wording describes haiku by its content and by the cut between images, and names no syllable count at all. Most published English haiku today run shorter than seventeen syllables.
Japanese counts morae, called on, not syllables. A long vowel counts as two on and the syllabic n counts as one on all by itself, so the word haiku is three on but two English syllables, and Tokyo is four on but two English syllables. Seventeen on therefore carries far less than seventeen English syllables. The Haiku Society of America's figure is that about twelve English syllables approximate the duration of seventeen Japanese on, and most practical guidance lands somewhere in the ten-to-fourteen band; the exact number varies with who is counting and which poem is being measured.
Subject and stance, not shape. Haiku turns on nature and season and usually carries a season word plus a cut between two images. Senryu, named for the eighteenth-century poet Karai Senryu, targets human behaviour, ego, and social awkwardness, and is often ironic or comic; it needs neither a season word nor a cutting word. The same seventeen sounds can read as either, which is why editors classify borderline poems by where the attention lands.
Tanka is the older form. It runs 5-7-5-7-7 for thirty-one on and descends from classical waka, the court poetry of the Manyoshu and the Kokinshu, centuries before haiku split off from linked verse. Tanka openly permits metaphor, simile, direct emotion, and love as a subject, all of which traditional haiku avoids. The closing 7-7 pair, the shimo-no-ku, usually turns or comments on the opening 5-7-5.
A kigo is a season word, a term that fixes the poem in a specific time of year: cherry blossom for spring, cicada for summer, scarecrow for autumn, frost for winter. Japanese kigo are catalogued in reference books called saijiki, which sort thousands of entries by season and category. Traditional haiku schools treat the kigo as mandatory. Modern gendai practice accepts muki, or seasonless, haiku, and the Haiku Society of America treats the season reference as characteristic rather than required.
The saijiki still follows the old lunisolar boundaries, which start each season about six weeks earlier than the Western solstice-and-equinox scheme. Spring opens at risshun in early February, summer at rikka in early May, autumn at risshu in early August, and winter at ritto in early November. That is why Tanabata in early August is an autumn topic and why the year's hottest weather sits in autumn kigo. New Year is handled as a fifth season with its own section.
A kireji cuts the poem in two so that the reader feels a pause and then a jump between the two images. Japanese uses grammatical particles for this, most often ya for emphasis and pause, kana for a closing sigh, and keri for completed past; classical lists name eighteen such words. English has no equivalent particle, so the cut is marked with punctuation - a dash, colon, ellipsis, or period - or simply left to the line break. The cut belongs at the end of line one or line two, never in the middle of the middle line.
Traditional haiku does none of the three. Japanese rhymes trivially because so many words end in the same few vowels, so rhyme carries no weight and was never a device of the form. Titles are absent because the poem is meant to arrive without framing, and journals print haiku untitled. Metaphor is the contested one: classical practice prefers the bare image and lets juxtaposition do the work, while many contemporary English editors publish metaphor when it is not decorative.
Matsuo Basho (1644-1694) raised the opening verse of linked poetry into a standalone art and wrote the travel journal Oku no Hosomichi. Yosa Buson (1716-1784) was also a painter and brought a composed, visual richness to the form. Kobayashi Issa (1763-1828) wrote with plain compassion about insects, animals, poverty, and his own losses. Masaoka Shiki (1867-1902) put the term haiku into general use for the standalone verse, which had been called hokku, and pushed the shasei, or sketch-from-life, method that shaped the modern form.
Teach the shape as short, longer, short, and mention that Japanese haiku count sound units rather than English syllables, so 5-7-5 is a useful practice frame and not a law. Anchor the lesson in observation: one season, one concrete thing the child actually saw, and no explaining of feelings. Have them place a break after line one or line two so the poem has two parts that spark against each other. Counting syllables by clapping still works well as a warm-up, as long as nobody is told the poem fails at sixteen.