A calligraphic work on a shikishi board with the themes of "Maximum Efficiency of Energy" and "Mutual Prosperity." - Medium: Shikishi board - Content: Maximum Efficiency of Energy, Mutual Prosperity - Technique: Handwritten reproduction - Description: For the most efficient use of maximum energy and mutual prosperity. - Creator: Master Jigoro Kano The shikishi board has never been opened. An explanatory note from the Kodokan is attached to the back. There is a slight wrinkle on a part of the shikishi board, but it is not very noticeable.