Wondering if a Haiku is a poem or an order at a sushi bar? Here's a primer. A Haiku is a three-line poem that doesn't have to rhyme. The only rule is that the first line has five syllables, the second line has seven syllables, and third line has five syllables. Other than that, you're free to express yourself any way you wish. The poem can be from your point of view or the dog's or even the duck's.