Compare the contrasting colours in both these works & influence from Turner in John Piper's work.

John Piper, Rocks of the Dovy, 1943-4, Oil on canvas on board © The John Piper Estate

Source: http://www.museumwales.ac.uk/en/whatson/?event_id=5434

Joseph Mallord William Turner, Shade and Darkness - the Evening of the Deluge exhibited 1843 Joseph

Source http://www.tate.org.uk/art/artworks/turner-shade-and-darkness-the-evening-of-the-deluge-n00531