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| Olympe Aguado Tree in the Bois de Boulogne 1856 waxed paper negative Clark Art Institute, Williamstown, Massachusetts |
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| Olympe Aguado Tree in the Bois de Boulogne 1856 albumen silver print Fine Arts Museums of San Francisco (Achenbach Foundation) |
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| Benjamin Brecknell Turner Hedgerow Trees, Clerkenleap ca. 1852 calotype paper negative Victoria & Albert Museum, London |
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| Benjamin Brecknell Turner Hedgerow Trees, Clerkenleap 1852 salted paper print Getty Museum, Los Angeles |
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| Thomas Frederick Collier Study of a Chestnut Tree 1855 watercolor Victoria & Albert Museum, London |
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| Thomas Frederick Collier Study of an Elm Tree ca. 1860 watercolor Victoria & Albert Museum, London |
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| Ingeborg Tyssen Gladesville, Sydney 1981 inkjet print National Gallery of Victoria, Melbourne |
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| David Wadelton Preston Tree 1977 gelatin silver print National Gallery of Victoria, Melbourne |
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| Paul Cézanne Pistachio Tree at Château Noir ca. 1900 watercolor Art Institute of Chicago |
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| Charles Demuth Trees No. 2 1916 watercolor Princeton University Art Museum |
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| William Blake A Poison Tree (Songs of Innocence and Experience) 1794 color-printed and hand-colored relief-etching Yale Center for British Art |
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| William Blake A Poison Tree (Songs of Innocence and Experience) ca. 1825 color-printed and hand-colored relief-etching Metropolitan Museum of Art, New York |
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| Adolph Engel Set Pieces of Greenery for Puppet Theater ca. 1890 hand-colored lithograph Gemäldegalerie, Dresden |
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| Julius Hermann Oehme Oak Trees - Scenery for Puppet Theater before 1880 hand-colored lithograph Gemäldegalerie, Dresden |
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| John Constable Study of the Trunk of an Elm Tree ca. 1821 oil on paper Victoria & Albert Museum, London |
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| Lucian Freud After Constable's Elm 2003 etching Victoria & Albert Museum, London |
from Paired Things
So many paired things seem odd.
– Kay Ryan (1994)