It was systematized as 'Monko (聞香; or 門香 also pronounced as Monko in Japanese; see "Monko" below)' which means listening to and appreciating Koboku incense, and furthermore as Kumiko (see "Kumiko" below) which is a game of distinguishing different types of incense by listening.
特に、香木の香りを聞き、鑑賞する「聞香」（門香）、さらに香りを聞き分ける遊びである組香（組香）として体系化したものである。