The works that Henri Matisse (1869-1954) executed between late 1913 and 1917 are among his most demanding, experimental, and enigmatic. Often sharply composed, heavily reworked, and dominated by the colors black and gray, these compositions are rigorously abstracted and purged of nearly all descriptive detail. Although they have typically been treated as unrelated to one another, as aberrations within the artist's oeuvre, or as singular responses to Cubism or World War I, Matisse: Radical Invention, 1913-1917 reveals the deep connections among them.