Landscape painting flourished in the 19th century, ranging from the epic, through rustic nostalgia to the naturalism championed by John Constable. He based what he called his ‘natural painture’ on study of nature, experience of his subjects and attention to working life, especially in the Stour Valley where his father was a miller and merchant. When possible, he sketched or worked on pictures outdoors. Flatford Mill shows barges approaching Flatford footbridge after passing through the lock near his father’s mill. Its bright, airy realism was unprecedented at the time.