Metropolitan Museum of Art article on Muromachi Period
Sesshu Toyo example & article at the British Museum
Sesshu Toyo entry at Wikipedia
More Sesshu
Entry on Zen at Wikipedia
"Zen Buddhism’s emphasis on simplicity and the importance of the natural world generated a distinctive aesthetic, which is expressed by the terms wabi and sabi. These two amorphous concepts are used to express a sense of rusticity, melancholy, loneliness, naturalness, and age, so that a misshapen, worn peasant’s jar is considered more beautiful than a pristine, carefully crafted dish. While the latter pleases the senses, the former stimulates the mind and emotions to contemplate the essence of reality. This artistic sensibility has had an enormous impact on Japanese culture up to modern times."
