The imagery in this stanza appeals primarily to the reader’s sense of

The answer would be sight because the stanza says nothing about smelling something, and does not mention hearing or feeling anything. All the stanza does is describe the narrator's surroundings, which would be why the imagery appeals to the reader's sense of sight.

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.