The city of Washington is widely known for a keen appreciation of the social arts:  Politics, for example or the fine art of diplomacy. But an important development in the history of the visual arts had its origins here as well. It is called the "Color Field" movement, and it is the subject of a major new exhibition now underway in the nation's capital.  As VOA's George Dwyer reports, the passing of years appears to have cast this colorful school of painting in a whole new light.