Anamorphosis of Napoleon, l'Aiglon, Josephine and Prince Eugène. 19th century
This lenticular engraving uses an optical illusion to show two different subjects in different orientations: Emperor Napoleon and his son L'Aiglon (called Duke of Reichstadt, 1811-1832), then Empress Josephine and her son (1st marriage) Eugène de Beauharnais (Duke of Leuchtenberg, 1781-1824).