Helen Frankenthaler has received international recognition since the 1950s, when, in her twenties, she emerged as a leading New York artist who played a pivotal role in the transition from Abstract Expressionism to the Colorfield painting of the 1960s. Over the past decade, in fact, the artist's works on paper have assumed a stature equal to that of her canvases and often catch the most highly charged and vibrant aspects of her art. Her masterful...