Following the appearance of the earliest Daguerreotypes in the late 1830s and above all after the subsequent discovery of photographic printing on paper, the relationship between photography and painting became an extremely close one. The camera's artificial eye in the work of photographers such as Le Gray, Cuvelier, Nadar and Disderi, to mention just a few, stimulated Manet, Degas and the young Impressionists to develop a new way of looking at the world. Impressionism used the medium not just as an iconographic source but was also inspired by it technically in its scientific observation of light, its representation of an asymmetrical, truncated pictorial space and its exploration of spontaneity and visual ambiguity. In addition, the new Impressionist type of brushstroke led some photographers to become interested in the materiality of their images and to look for ways of making their photographs less precise and more pictorial in effect.