The kanbun scholar Okada Masayuki (岡田正之) considered yō to be a metaphor comparing the massive collection of poems to the leaves on a tree.
Proučavatelj kanbuna Okada Masayuki (岡田正之) smatrao je da 葉 yō jest metafora kojom se uspoređuje ogromna zbirka pjesama s lišćem na stablu.