Classical Landscape, 1779. The leading landscape painter of the late 18th century, Valenciennes was also an important theoretician whose book Elements of Practical Perspective influenced generations of French artists who followed. In the book, the artist described two ways of envisioning nature: "seeing it as it is," and "seeing it as it could be." He preferred the latter, believing that it demanded more of the imagination than merely copying the natural world. The perfection of the setting reflects the noble, classical subject: three maidens cutting their hair and offering it on an altar to a river god.