Impressionism is a light, spontaneous manner of painting which began in France as a reaction against the formalism of the dominant Academic style. Its naturalistic and down-to-earth treatment of its subjects has its roots in the French Realism of Corot and others. The movement's name came from Monet's early work, Impression: A Sunrise, which was singled out for criticism by Louis Leroy on its exhibition. The hallmark of the style is the attempt to capture the subjective impression of light in a scene. The core of the earliest Impressionist group was made up of Claude Monet, Auguste-Pierre Renoir, and Alfred Sisley. Others associated with this period were Camille Pissarro, Edgar Degas, Gustav Caillebotte, Frédéric Bazille, Édouard Manet, and Mary Cassatt. The Impressionist style is still widely practiced today. However, a variety of successive movements were influenced by it, grouped under the general term Post-Impressionism.