Usually when we think of the avant-garde, we think of testing limits and pushing boundaries, or we think of outrageousness and oddness. We also tend to think of Europe, where the movement started and really took off. Yet the Luther W. Brady Art Gallery’s Out of the Chateau: Works from the Demuth Museum is exhibiting some 30 works by American Charles Demuth (1883-1935), an artist who produced a tamer form of avant-garde art and helped......