dead mother; in The Golden Slipper, a fish aids her after she puts it in water. In "The Anklet", it's a magical alabaster pot the girl purchased with her own money that brings her the gowns and the anklets she wears to the ball. Gioachino Rossini, having agreed to do an opera based on Cinderella if he could omit all magical elements, wrote La Cenerentola, in which she was aided by Alidoro, a philosopher and formerly the Prince's tutor. The midnight curfew is also absent in many versions; Cinderella leaves the ball to get home before her stepmother and stepsisters, or she is simply tired. In the Grimms' version, Aschenputtel slips away when she is tired, hiding on her father's estate in a tree, and then the pigeon coop, to elude her pursuers; her father tries to catch her by chopping them down, but she escapes. Identifying item The glass slipper is unique to Charles Perrault's version and its derivatives; in other versions of the tale it may be made of other materials (in the version recorded by the Brothers Grimm, German: Aschenbroedel and Aschenputtel, for instance, it is gold) and in still other tellings, it is not a slipper but an anklet, a ring, or a bracelet that gives the prince the key to Cinderella's identity. In Rossini's opera "La Cenerentola" ("Cinderella"), the slipper is replaced by twin bracelets to prove her identity. In the Finnish variant The Wonderful Birch the prince uses tar to gain something every ball, and so has a ring, a circlet, and a pair of slippers. Some interpreters, perhaps troubled by sartorial impracticalities, have suggested that Perrault's "glass slipper" (pantoufle de verre) had been a "squirrel fur slipper" (pantoufle de vair) in some unidentified earlier version of the tale, and that Perrault or one of his sources confused the words. However, most scholars believe the glass slipper was a deliberate piece of poetic invention on Perrault's part. Nabokov has Professor Pnin assert as fact that "Cendrillon's shoes were not made of glass but of Russian squirrel fur – vair, in French". The 1950 Disney adaptation takes advantage of the slipper being made of glass to add a twist whereby the slipper is shattered just before Cinderella has the chance to try it on, leaving her with only the matching slipper with which to prove her identity. Revelation In many variants of the tale, the