Alphonse Mucha had developed his own personal style characterized by Art Noveau elements, tender colors and bycantine decorative elements. All those elements were ranked around images of fairy like young women with long hair and splendid, refined costumes. In the coming years, this type of female images should become his trademark. Mucha used lithography as the printing technique for his posters. The posters are usually signed in the block. Some of his posters were produced as sets like The Four Seasons. Complete sets count among the most searched for of his works. Mucha produced a flurry of paintings, posters, advertisements and book illustrations as well as designs for jewelry, carpets, wallpaper and theatre sets following the pattern which was initially called the Mucha Style but became known as Art Noveau later on. Unlike other contemporary poster makers he used pale pastel colors. The 1900 Universal Exhibition in Paris spread the "Mucha Style" to the whole world. Mucha then said "I think I have done some contribution to bringing aesthetic values into arts and crafts". Mucha became famous in December 1894 with a commission for a poster for the actress Sarah Bernhard. She was a celebrity of her time. His poster design for the play Gismonda became a sensation in Paris. Sarah was delighted. Mucha received an exclusive contract for six consecutive years by the actress. In the following years, he not only designed all her posters, but also her theater decorations and costumes. This has triggered enormous demand for all kind of commercial printed advertising designed by Mucha. As soon as the new building of the Municipal House was built in Prague in the Art Noveau style, Mucha offered to decorate the interiors free of charge as a present to the Czech nation. His other task was to make sketches for postal stamps. Mucha completed their design in a very short time. Later on, when designing banknotes, he even used a portrait of his own daughter for their reverse side. People can admire a beautiful stained-glass window made by Mucha for the St. Vitus Cathedral.