ISBN: | 978-5-5126-7978-4 |
High Quality Content by WIKIPEDIA articles! Four Treasures of the Study, Four Jewels of the Study or Four Friends of the Study is an expression used to denote the brush, ink, paper and ink stone used in Chinese and other East Asian calligraphic traditions. The name appears to originate in the time of the Southern and Northern Dynasties (420-589 AD).