 Haiku have also appeared in circular form (sometimes known as "cirku") whereby the poem has no fixed start or end point.In the "zip" form developed by John Carley, a haiku of 15 syllables is presented over two lines, each of which contains one internal caesura represented by a double space.A fixed-form 5-3-5 syllable (or 3-5-3 word) haiku is sometimes known as a "lune".