Originally it was not a good concept, however, in "Tsurezuregusa" (Essays in Idleness), there was a description thought to deeply appreciate a book that became old and it has been verified that around this time the meaning of discovering the beauty of an antiquated state arose.
本来は良い概念ではなかったが、『徒然草』などには古くなった冊子を味わい深いと見る記述があり、この頃には古びた様子に美を見出す意識が生まれていたことが確認される。