Asher B. Durand, Trees on a Rocky Hillside, c. 1849, oil on canvas, Cleveland Museum of Art, Cleveland. https://dartabase.art/cite/cleveland/143772

Joseph Mallord William Turner, Flüelen, from the Lake of Lucerne, 1845, watercolor with gouache and scratch-away, Cleveland Museum of Art, Cleveland. https://dartabase.art/cite/cleveland/131338