No one ever worked more constantly and faithfully from Nature, or became more intimately acquainted with the subtle outward expressions of her innermost moods; but the profound knowledge thus gained was only treated as the poet treats a wide vocabulary; as a means of expression, not as in itself worth exploitation. The scene before him was not recorded as a collection of facts, but as it had stirred his emotions, and as it was, in a sense, transformed by his vivid imagination. The resulting picture is the record of an adventure of the soul; the outward reality is not lost, but rather realised in a strange intensity. "See," said Corot, pointing to one of his landscapes, "see the shepherdess leaning against the trunk of that tree. See, she turns suddenly. She hears a field-mouse stirring in the grass."
Of how the artist went to work when he had "found" a new landscape some notion may be gained from M. Silvestre's description. "If Corot sees two clouds that at first sight appear to be equally dark, he will, before building up the whole harmony of his picture on one or other of them, apply himself to discover the difference he knows must exist. Then, when he has decided on the darkest as well as the lightest tone in the scene before him, the intermediate values readily take their places, and subdivide themselves indefinitely before his discerning eyes. These values, from the most positive to the most vague, call to one another and give answer, like echo and voice. When the artist sees he can divide the principal values of the landscape before him into four, he does so by numbering the different parts of his rough sketch from 1 to 4, 4 standing for the darkest and 1 for the lightest patch, while the intermediate tones are represented by 2 and 3. This method enables Corot, with the help of any old pencil and any scrap of paper, to make records of the most transitory effects seen upon a journey. Corot was not a man to make an inventory of his sentiments, and the fact that he made such records proves that they were sufficient for his own purposes. As a rule he first of all puts in his sky, then the more important masses in the middle of the composition, then those to the left and to the right; he then picks out the forms of the reflections in the water, if there is water, and so establishes the planes of his picture, his masses falling in one behind the other while one watches him. Sometimes he proceeds in a less orderly way; for it goes without saying that his methods are the methods of freedom, and not the invariable recipes of a pedant. He runs an unquiet eye over every part of the canvas before putting a touch in place, sure that it does no violence to the general effect. If he makes haste he may become clumsy and rough, leaving here and there inequalities of impasto. These he afterwards removes with a razor, as if he were shaving his landscape, and leaving himself free to profit by such accidents of surface as are happy in effect."