The long-awaited art collection by Shoko Otani, who draws attention as an impressive bokusoga artist. "Bokusoga" is a type of Japanese sumi-e art which uses ink-wash painting with watercolor. Otani's bokusoga represents the world of soul and idea in Zen. In-depth interviews were conducted for this book to introduce the Japanese conception of nature and religious ideas that Otani presents in her work. In order to appeal to readers at home and abroad, the book contains captions in both Japanese and English.