https://spice.fsi.stanford.edu/docs/the_history_and_artistry_of_haiku
“In Japanese, a haiku poem is usually divided into three groups/lines of syllables, the first and last with five syllables, the second with seven. However, be careful not to get stymied by strict adherence to the number of syllables and miss the essence of haiku. The 17 syllables is not an absolute rule. Most Japanese syllables are short, as in po-ta-to. English syllables can be long, and take up too much space in a haiku, so English haiku frequently have fewer than 17 syllables, sometimes as few as ten.”
