 Corollary to Gaṅgeśa’s thesis of the apperceptibility of cognitive types is his view that illusion can be scoped such that there too we find, abstractly, a cognition of an object as qualified by a qualifier, for example, of a piece of tin appearing to be silver. He also presents the argument that the fact that we can later see the same thing as really the tin it is shows that the illusion is a single cognition and not, contra the Prābhākara, two cognitions, a perception and a remembering along with a failure to notice their difference. But scoping an illusory awareness is supposed to show this, too, and in a particularly dramatic way when one knows that the cognition is illusory while it continues, such as apparent sight of a double moon or a person with hepatitis seeing a wall she knows is white as yellow. Although apperception is said not in itself to be able to determine the veridicality of an awareness, in such a case the subject practically sees one thing (the wall) appearing to be something it is not (yellow), anyathā-khyāti.