Horse and Rider, c. 1916. Gouache, watercolour, black ink and graphite on paper, 13.3 x 10.5 in. (34 x 26.5 cm). Private collection. Photo Malcolm Varon ©Bianca Stock

Horse and Rider, c. 1916. Gouache, watercolour, black ink and graphite on paper, 13.3 x 10.5 in. (34 x 26.5 cm). Private collection. Photo Malcolm Varon ©Bianca Stock

Horse and Rider, c. 1916