The Haywain by John Constable, 1821, The National Gallery of Art, London.
One of the most important British painters of the 19th century, Constable believed in painting out of doors in order to capture the most true, and realistic atmospheres, for his paintings. He did studies of nothing but clouds, so that he could render them perfectly. This is his most famous work featuring a hay cart, or hay wain, being ferried across the River Stour. The house in the background still exists and is in the care of the National Trust.
