The White Horse (1819) by John Constable (1776-1837) depicts a tow-horse being ferried across the river Stour in Suffolk, just below Flatford Lock at a point where the tow-path switched banks. Constable, who described the scene as "as placid representation of a serene, grey morning, summer," went on in later years to comment: "There are generally in the life of an artist perhaps one, two or three pictures, on which hang more than usual interest--...