NEW YORK.- A British graffiti artist who calls himself Bansky placed during the last two weeks humorous artworks at four New York museums: the Museum of Modern Art, the Metropolitan Museum of Art, the Brooklyn Museum and the American Museum of Natural History. The works were attached to the walls among other museum works. Banksy had done this before at the Louvre in Paris and Tate museum in London. All of the museums discovered the works and took them off the walls. The website www.woostercollective.com received images of the works that were hung at these museums.