Post-Impressionism is an umbrella term, coined by art critic Roger Fry, used to describe a variety of artists who were influenced by Impressionism but took their art in different directions. There is no single well-defined style of Post-Impressionism, but in general it is less casual and more emotionally charged than Impressionist work. The classic Post-Impressionists are Paul Cézanne, Paul Gauguin, Vincent van Gogh, Georges Seurat, Henri de Toulouse-Lautrec, and Henri Rousseau. The Pointillists and Les Nabis are also generally counted among the Post-Impressionists.