Alex Katz is one of the world’s most important artists. He has addressed the concerns of abstraction while keeping his art rooted in the real world. With an economy of line and color, he conjures indelible images: landscapes and portraits. This is one of his signature portraits, a woman glamorous and distant, as much a study of form and light as it is a likeness. In the last few years, Katz has had museum shows at the National Portrait Gallery in London, the Albertina in Vienna, in Bruges, Madrid, Hanover and Dortmund, Germany, at the Philadelphia Museum of Art, and the Museum of Fine Arts, Boston.