The Hay WainSalisbury Cathedral from the MeadowsIn a letter to friend John Fisher, written in 1821, Constable commented, That landscape painter who does not make his skies a very material part of his composition, neglects to avail himself of one of his greatest aids . . . It will be difficult to name a class of landscape in which the sky is not the key note, the standard of scale, and the chief organ of sentiment.Constables Skies