The Book of Five Rings: a graphic novel, by writer Sean Michael Wilson and Japanese artist Chie Kutsuwada, 2012, Shambhala Publications, Boston, USA.
The cover art from Volumes One and Two are the kanji characters for "earth" and "water", respectively, which relate to the first volumes of The Book of Five Rings written by Miyamoto Musashi.
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This ring, like the other four, is taken from Miyamoto Musashi's The Book of Five Rings, although "Nothingness" is a better translation of the text.