Mathematical logicians study formal systems but are just as often realists as they are formalists. Joseph Grieco has combined neo-realist thinking with more traditional realists. The pioneers of modern art were Romantics, Realists and Impressionists. There was debate between the realists and the nominalists over the concept of "universals". Criticisms of moral skepticism come primarily from moral realists. Weinberg is a legal theorist in the tradition of the American legal realists. The latter was a coalition of various unorthodox-left politicians and more liberal "realists". Crow argues that the leaders of Latin America were realists. Scandinavian legal realists also took a naturalist approach to law. Many writers are categorized as "magical realists", which confuses the term and its wide definition. Among Hindu realists, this thesis was criticized for being negative. Truth and accuracy became the goals of many realists as Gustave Courbet. The following claims are typical of those held by scientific realists. It is made by realists who are not afraid to dream. Hopper is the most modern of the American realists, and the most contemporary.