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Horse chestnut leaf from John Ruskin’s "Lecture on Tree Twigs", 1861.
Caspar David Friedrich, Wanderer above the Sea of Fog, 1818, oil on canvas, 98.4 x 74.8 cm, Kunsthalle Hamburg, Hamburg.
Unknown artist, Portrait of Immanuel Kant, 18th century.
Graph showing a positive parabolic curve intersected by the x axis at 1848 and 1989.
Sir John Everett Millais, John Ruskin, 1853, 78.7 x 68 cm, Ashmolean Museum, University of Oxford, Oxford.
Portfolio illustration from John Ruskin’s The Stones of Venice (1851–1853).
The Coniston Mechanics Institute and Literary Society, c. 1872.
Exhibition Museum of Arte Útil, Van Abbemuseum, Eindhoven, 2013.
John Ruskin, Rough Sketch of Tree Growth: Macugnaga, 1872, pen and ink, watercolour and body colour over graphite on pale grey wove paper, 22.8 x 16.6 cm, Ashmolean Museum, University of Oxford, Oxford.
John Ruskin, Kingfisher, c. 1870–1871, pencil, ink, watercolour and gouache, 25.8 x 21.8 cm, Tate Britain, London.
Portrait of Saint Bonaventure (1221–1274).
Horace Vernet, Barricade on the rue Soufflot on 24 June 1848, 1848.
Russian Prime Minister Vladimir Putin rides a horse during his vacation outside the town of Kyzyl in Southern Siberia on August 3, 2009. AFP PHOTO/RIA-NOVOSTI/ALEXEY DRUZHININ/ADDITIONAL CROP VERSION.
Middlesbrough Institute of Modern Art (MIMA), Middlesbrough.