Among the Impressionists Sisley has been overshadowed by Monet, although his work most resembles that of Camille Pissarro. Described by art historian Robert Rosenblum as having "almost a generic character, an impersonal textbook idea of a perfect Impressionist painting", his work strongly invokes atmosphere and his skies are always very impressive. His concentration on landscape subjects was the most consistent of any of the Impressionists.