One of the most enduring literary themes connected with the figure of Circe was her ability to change men into animals. There was much speculation concerning how this could be, whether the human consciousness changed at the same time, and even whether it was a change for the better. The Gryllus dialogue was taken up by another Italian writer, Giovan Battista Gelli, in his "La Circe" (1549). This is a series of ten philosophical and moral dialogues between Ulysses and the humans transformed into various animals, ranging from an oyster to an elephant, in which Circe sometimes joins. Most argue against changing back; only the last animal, a philosopher in its former existence, wants to. English poet Edmund Spenser also makes reference to Plutarch's dialogue in the section of his "Faerie Queene" (1590) based on the Circe episode which appears at the end of Book II. Sir Guyon changes back the victims of Acrasia's erotic frenzy in the Bower of Bliss, most of whom are abashed at their fall from chivalric grace, "But one above the rest in speciall, / That had an hog beene late, hight Grille by name, / Repined greatly, and did him miscall, / That had from hoggish forme him brought to naturall."