 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.