A doll is a childhood toy which gets put away when one is older.One has to assume responsibilities and behave in a more adult way, so the youth doll must be replaced by an older, more mature person. However, this doll is not discarded but put "in a closet", that is, kept within the person; as the poet says later: "in the dark". It is an integral part of a person and this cannot be discarded. The qualities and emotions of youth are not forgotten, just as a precious doll is not forgotten.