'The most important Japanese artist you've never heard of." That is how James Ulak, senior curator of Japanese art at the Arthur M. Sackler Gallery in Washington, describes Tawaraya Sotatsu, the focus of the gallery's current magnificent exhibition. The show presents the first in-depth examination of the master to be held in the United States, and while Sotatsu may not be a household name, the exhibition does much to illuminate us on this brilliant and intriguing artist.