BERLIN.- For the first time in Germany a major retrospective is being devoted to the world- famous Japanese artist Hokusai (1760-1849). Perhaps his best-known picture is the woodcut: The Great Wave off Kanagawa from the series: Thirty-six Views of Mount Fuji (1823-29). Over 440 loans, which with few exceptions come from Japan, are on display in the exhibition in Berlins Martin-Gropius-Bau. NAGATA Seiji, the leading Japanese authority on Hokusai and his work, curated the exhibition, which is shown exclusively in Berlin. Works from all periods of the artists career woodcuts and drawings, illustrated books, and paintings are on show. In 2000 Life Magazine ran a survey to find out who were the most significant artists in world history. Hokusai came 17th, ahead of Picasso. The exhibition which covers the entire span of Hokusais creative activity, extending wel