it "sweeps out impurities". Mirror The small medallions set into the frame of the convex mirror at the back of the room show tiny scenes from the Passion of Christ and may represent God's promise of salvation for the figures reflected on the mirror's convex surface. Furthering the Memorial theory, all the scenes on the wife's side are of Christ's death and resurrection. Those on the husband's side concern Christ's life. The mirror itself may represent the eye of God observing the vows of the wedding. A spotless mirror was also an established symbol of Mary, referring to the Holy Virgin's immaculate conception and purity. The mirror reflects two figures in the doorway, one of whom may be the painter himself. In Panofsky's controversial view, the figures are shown to prove that the two witnesses required to make a wedding legal were present, and Van Eyck's signature on the wall acts as some form of actual documentation of an event at which he was himself present. According to one author "The painting is often referenced for its immaculate depiction of non-Euclidean geometry", referring to the image on the convex mirror. Assuming a spherical mirror, the distortion has been correctly portrayed, except for the leftmost part of the window frame, the near edge of the table and the hem of the dress. Other objects The little dog may symbolize fidelity (fido), loyalty, or alternatively lust, signifying the couple's desire to have a child. Unlike the couple, he looks out to meet the gaze of the viewer. The dog could be simply a lap dog, a gift from husband to wife. Many wealthy women in the court had lap dogs as companions, reflecting the wealth of the couple and their position in courtly life. The dog appears to be a Griffon terrier, or perhaps a Bolognese dog. The green of the woman's dress symbolizes hope, possibly the hope of becoming a mother. Its intense brightness also indicates wealth, since dyeing fabric such a shade was difficult and expensive. Her white cap could signify purity or her status as married. Behind the pair, the curtains of the marriage bed have been opened; the red curtains might allude to the physical act of love. The single candle in the left-front holder of the ornate six-branched chandelier is possibly the candle used in traditional Flemish marriage customs. Lit in full daylight, like the sanctuary lamp