A 19th century French painter long ignored by the American public, Georges Seurat is generating a good deal of excitement this year. A comprehensive exhibition of his works, now hanging in the Museum of Modern Art in Manhattan, is built around his masterpiece, La Grande Jatte (above). A pleasantly sportive scene of genteel Parisians enjoying sunny leisure on the small island park in the Seine, this painting was done in pointillism, the artist's highly individual style.