The structure of the sestina, which demands adherence to a strict and arbitrary order, produces several effects within a poem. Stephanie Burt notes that, "The sestina has served, historically, as a complaint", its harsh demands acting as "signs for deprivation or duress". The structure can enhance the subject matter that it orders; in reference to Elizabeth Bishop's "A Miracle for Breakfast", David Caplan suggests that the form's "harshly arbitrary demands echo its subject's". Nevertheless, the form's structure has been criticised; Paul Fussell considers the sestina to be of "dubious structural expressiveness" when composed in English and, irrespective of how it is used, "would seem to be form that gives more structural pleasure to the contriver than to the apprehender."