I like to think that Roland Barthes would have loved to use "The Road Not Taken" in his piece "Death of the Author"[0]. Truly, at a scale that's frankly staggering, agency has been given to the reader—though one could also argue that the clipped version of the poem often remembered is a case of remixing and rewriting and that the agency isn't merely passive interpretation but a very active creative endeavor.
0: http://www.ubu.com/aspen/aspen5and6/threeEssays.html#barthes