One of the earliest known ­images in British art is the engraving on bone of a horse’s head, found in 1876 at Creswell Crags, Derbyshire. It was discovered among the bones of ­numerous animals ...

This quality of common purpose is reminiscent of Stubbs’s Otho, with John Larkin up (1768), part of a meditative one-room show Stubbs and Wallinger: The Horse in Art at Tate Britain (until 6 ...