It was said that, Kokin denju, which Yusai HOSOKAWA inherited from Sankei SANJONISHI even relied on for the art of getting along with people during the Sengoku period, was about nothing but explaining where the trees mentioned in the poems existed (based on the study conducted by Masaharu FUJI).
また細川幽斎が三条西実枝から承継し、戦国の処世術としても用いた古今伝授は実際には「この歌に詠まれている木は、何処の木」といった由来に関する内容のものであったという（富士正晴の研究に依る）。