Ikka myōju (Japanese: 一顆明珠), known in English as One Bright Jewel or One Bright Pearl, is a book of the Shōbōgenzō by the 13th century Sōtō Zen monk Eihei Dōgen. It was written in the summer of 1238 at Dōgen's monastery Kōshō-ji outside of modern-day Kyoto. The essay marked the beginning of a period of high output of Shōbōgenzō books that lasted until 1246. The book appears as the seventh book in both the 75 and 60 fascicle versions of the Shōbōgenzō, and it is ordered fourth in the later chronological 95 fascicle Honzan editions. The essay is an extended commentary on the famous saying of the Tang Dynasty monk Xuansha Shibei that "the ten-direction world is one bright jewel", which in turn references the Mani Jewel metaphors of earlier Buddhist scriptures. Dōgen also discusses the "one br