Musashi, a 16th century Japanese warrior and perhaps the most famous ronin or roving swordsman in Japan's history, compiled a book of strategy based on his life's experience and observations. The language and imagery center on the five aspects of Ground, Water, Fire, Wind, and Void. Ground is the body of the way; Water is the spirit of the way, Fire is the way of battle, Wind is the way of old traditions, and Void is following the true way according to nature. The text is accompanied by many of Musashi's fine drawings and calligraphic works.