DALLAS, TX.- In 1952 Henri Matisse was asked to create a stained-glass window for the mausoleum of art collector Albert Lasker, and he took on the project with enthusiasm. His full-scale maquette was made with shapes cut out of painted paper and arranged with the help of assistants. This technique allowed the elderly Matisse to remain productive as an artist in his final years, when he was no longer able to paint. Ivy in Flower is one of the most joyous and exuberant of the large cutout works he made at the end of his life. Ivy in Flower is one of the first true masterpieces of European modernism to enter the Museums collection, said Heather MacDonald, The Lillian and James H. Clark Associate Curator of European Art.