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            | 29. William Blake, The First Book 
              of Urizen, plate 25, relief etching, 16.3 x 10.3 cm., etched 
              1794, proof impression color printed 1794, touched with yellow watercolors. 
              Beinecke Rare Books and Manuscript Library, Yale University. Detail, 
              showing image printed in colors and before being finished in watercolors 
              and pen and ink, and showing the white lines along the escarpments 
              between shallows and relief areas. |  |