- Hiroyuki Oka
Thank you for visiting. Enjoy my puzzle box." 1970 birth in Odawara, Japan. Graduation from the Tokyo (ESP) Guitar Craft Academy. Graduation from the Musashino art junior college. Practice of wood puzzle box was carried out at the work shop of "Hakone Yosegi Wood Mosaic and puzzle box" for ten years and independence. Own work shop (OKA CRAFT) was founded in 2003.