Clockwise, from top left: Milton Avery: "Umbrella by Sea," 1965, watercolor and gouache over charcoal. "L.H0.0.Q., 1919/1964," is Henri-Robert-Marcel Duchamp's photo-reproduction of da Vinci's 'Mona Lisa," enhanced with touches of pencil and gouache. Henri Matisse's stencil print for "Jazz," 1947. Marc Chagall: "Promenade," 1919, pencil, watercolor and gouache. 7/30 1999 Detroit Jewish News 75