This book presents the first comprehensive study of the “Yohen Tenmoku” bowl. The “Yohen Tenmoku” bowl is widely regarded as the most exquisite black-glazed tea bowl produced by the ancient Jian Kiln in China. Renowned for its dazzling, iridescent “Halos” and rich coloration, it has been celebrated as a "divine masterpiece under heaven" and often described as a "universe within a bowl." However, because of the scarcity and rarity of the“Yohen Tenmoku” bowl, little research has been conducted on it. In 2009, “Yohen Tenmoku” shards were unearthed at the site of the Southern Song Dynasty's Lin'an City—specifically at the original location of the Southeast Chemical Factory in Hangzhou—creating a stir in both archaeological and collecting communities. Since 2020, the authors of this book have employed various scientific methods to conduct a thorough and systematic investigation of these “Yohen Tenmoku” shards. Their research has successfully uncovered the manufacturing techniques behind the “Yohen Tenmoku” bowl and clarified the scientific principles involved. This study marks the world’s first comprehensive analysis of the “Yohen Tenmoku” bowl, distinguished by its originality and substantial academic significance. The “Yohen Tenmoku” bowl from the Jian Kiln embodies profound scientific knowledge and exceptional craftsmanship, serving as a brilliant representative of China’s ceramic heritage.