This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
A sijo has exactly three moves available to it, and the whole form lives in how a poet spends the third. The first line sets a situation, the second develops it, roughly doubling down on the first line's own direction, and the third line turns, an unexpected observation, a reversal or a sharpened point that recasts what the first two lines said. Comparisons to the haiku's own turn are common and not accidental; both are short forms built around a final pivot rather than a sustained development across many lines. The sijo's turn tends to land harder and more explicitly than a haiku's characteristically understated one, closer in spirit to an epigram's punchline than to a haiku's juxtaposition of two images left for the reader to connect, a difference in temperament between two short forms that otherwise look, at first glance, structurally similar.