Although no distinct landscape is known by the hand of Guido, yet in a history of this particular branch it may not be improper to notice its immense importance as an accessory in his picture of Aurora. It is the finest instance I know of the beauty of natural landscape brought to aid a mythological story, and to be sensible of its value we have only to imagine a plain background in its stead. But though Guido has placed us in the heavens, we are looking towards the earth, where seas and mountain-tops are receiving the first beams of the morning sun. The chariot of Apollo is borne on the clouds, attended by the Hours and preceded by Aurora, who scatters flowers, and the landscape, instead of diminishing the illusion, is the chief means of producing it, and is indeed most essential to the story.

Leslie, Life and Letters of John Constable, R.A. (London, new ed., 1896).