start of "Letras," the author introduces the concept of a "city of books," suggesting that ideas inhabit their own realm much like humans in a city. He employs a vivid metaphorical landscape to illustrate how ideas take form and shape, comparing them to individuals in different societal classes. Darío reflects on the architectural aspects of literature, likening books to houses that shelter ideas, and he further discusses the influences of cities like Paris, capturing how global literary movements interweave with local cultures. This opening portion sets a contemplative tone, establishing Darío as a thoughtful observer of the literary world and its myriad influences, while engaging readers with eloquent prose that invites deeper exploration of the subject matter. (This is an automatically generated summary.)