A haiku is a traditional Japanese short poem written in a 5 7 5 syllabic structure and usually broken up into two or three lines. The themes of a haiku often revolve around nature and seasons. To be a proper haiku, it must coform to a certain form: | A haiku is a traditional Japanese short poem written in a 5 7 5 syllabic structure and usually broken up into two or three lines. The themes of a haiku often revolve around nature and seasons. To be a proper haiku, it must coform to a certain form: |