The villain here is a face, and the face is short one eye. In the Grimm tale of the little brother and sister (collected 1812–1857; this English rendering 1884), the wicked step-mother is a witch who has trailed the runaway children through the wood, and her own child sits at the center of the treachery — a girl "as ugly as night, and had only one eye". When the true Queen has been suffocated in a bath heated to "such deadly heat" that she is soon smothered, the old woman lays this one-eyed daughter in the royal bed in her place, giving her "the shape and the look of the Queen". The fraud is nearly perfect but for the missing eye: "she could not make good the lost eye", and so the counterfeit must be arranged "on the side on which she had no eye", turned away from the returning King lest the deformity betray the swap.

That single unmatched socket is the whole hinge of the deception, and it is why Stith Thompson (1885–1976), the American folklorist whose motif-index gives this address its number, files the shape under deformed villains. The one eye is not merely ugliness; it is the tell, the place where the counterfeit cannot be finished, the seam a witch's craft cannot smooth over. The step-mother can steal a face and a station but not repair the flaw, and in a story built on impostures — enchanted brooks that murmur "Who drinks of me will be a tiger", a nurse who watches the dead Queen return night after night — the villain's defect is the one true thing on her, the mark that finally hands her to the judge and the fire.

Only the Grimm witness is wired to served text here; Thompson's German handbook citation and his Indian authority wait unread on the shelf. Why should the deceiver, of all the figures in a tale, be the one whose body refuses to lie?