Personal possessive pronouns? Sorry if this is wrong.
I believe it would be to inform, the particular excerpt isn't really informing about anything, and its not persuading the reader to do anything, simply attempting to entertain the reader with a story.
Kurt Vonnegut's short story "Report on the Barnhouse Effect'' is an example of a postmodernism literature in a way that he used it to spark some interest on self-consciousness and criticism on topics such as history, philosophy, politics and plenty others. However, he used a language that is used by everyday people and one that can relate to many in order to convey postmodernism.
Fish is to water as a bird is to air.
Duck and Sparrow are types of birds and it's not really logical for it to be butterfly, I don't think.
