These last two stories round out the seasonal section of Buzon de tiempo. "Revelación de otoño" is about an academic couple, who decided somewhat late in life to adopt a daughter. It's an interesting sketch of their lives, their friends and interests. The conflict arises at the end, when the daughter decides that she wants to know about her biological mother. As with the spring story, the seasonal connection doesn't seem as integral as it could be.
"El invierno propio" (One's own winter) is, unsurprisingly, about death. An old professor thinks about life and death as he sits in his library, looking at all the books. There's a certain elegance to the simplicity of the piece, and any bibliophile can appreciate the feelings of nostalgia of looking at books that have accompanied one through life.