In the first five sentences, the author illustrates the way in which the narrator wishes to tell her father's story. He and his condition are not described with language, but created in it. The metaphors which the narrator uses do not help to make her father "recognizable" to the reader, rather, they call attention to the language and testify that the act of writing will intrude upon the tale. The father protests. It is a description of him, after all, and, "despite [her] metaphors," he and his "potassium shortage," would like to be found within it. It would seem to the father that his daughter has forgotten the responsibilities of the writer.
A Conversation with My Father