Birds and Flowers of the Four Seasons, a National Treasure by Kanō Eitoku, for a monastery National Treasures (国宝: kokuhō) are the most precious of Japan's Tangible Cultural Properties, as determined and designated by the Agency for Cultural Affairs (a subsidiary of the Ministry of Education, Culture, Sports, Science and Technology). A Tangible Cultural Property is considered to be of historic or artistic value, classified either as "buildings and structures", or as "fine arts and crafts". Each National Treasure must show outstanding workmanship, a high value for world cultural history, or exceptional value for scholarship.
Source: Wikipedia