Yoshiyuki Ninomiya's book of unique and elegant works. He has made various works such as Secret Box, Karakuri Box, Yosegi, Furnishing Work, and Interlocking Puzzles. Includes photos of all 10 solo exhibitions. In a special interview, he talked about his 70 years of work, and about the skill and the background of his elegant Secret Boxes. His approach to the history of Secret Box from a craftsman’s point of view. Published 05/2017 All color, 60 pages in Japanese and English