He invented the term haiku (replacing hokku) to refer to the freestanding 5–7–5 form which he considered the most artistic and desirable part of the haikai no renga.
Jis sugalvojo terminą haiku (pakeitusį hokku) 5-7-5 formai, laikomai artistiškiausia ir geidžiamiausia haikai no renga dalimi.