With his instantly recognizable decorative style, Czech artist and Art Nouveau master Alphonse Mucha (1860-1939) defined the look of the fin-de-si cle. In evocative shades of peach, gold, ochre, and olive, his seductive compositions of patterns, flowers, and beautiful women became paradigms of the Belle poque years. Mucha's work permeated illustration, posters, postcards, and the advertising designs of his day. His striking posters of star actress...