I've missed most of the discussion of anamorphosis and anamorphic images, so I apologize if this has already been mentioned: The topic is pretty thoroughly covered in Ralph Ciancio, "Nabokov's Painted Parchments," in _Nabokov at the Limits_ (ed. Lisa Zunshine; Garland 1999), 235-69, esp. 252-64. The article is well illustrated and includes a photograph of a real-life nonnonic pair (curvilinear anamorphic butterfly picture and accompanying cylindrical mirror), an example of a type of optical toy that "circulated in shops during Nabokov's childhood" (259).

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