“Leaders of one-artist museums across the country — including the Andy Warhol Museum in Pittsburgh, the Norman Rockwell Museum in Stockbridge, Mass., the Isamu Noguchi Museum in New York and the C.M. Russell Museum in Great Falls, Mont. — spend their days dreaming up ways to promote the legacies of individual artists. Instead of creating a shrine or a morgue, directors of these museums try to position the artist as the center of a universe that reaches out to scholars, artists and the public.” And the number of such museums has grown in the U.S. in recent years.