Iconclass is a specialized library classification designed for classifying the subjects and content of images in art. It was originally conceived by the Dutch art historian Henri van de Waal in the 19
The Threatened Swan, c. 1650, Jan Asselijn, Rijksmuseum, Amsterdam, Classed as: 45A10 = 'symbols, allegories of war; 'Guerra' (Ripa)' 25F36(SWAN) = 'water-birds' 34B11 = 'dog' 41C642 = 'eggs, egg-dishes'