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The character 洞 (dòng) evolved from ancient pictographs representing water flowing through a cavity or opening. Its composition combines the 'water' radical (氵) with the phonetic component 同, suggesting both sound and meaning - a water-filled cavity or grotto. Originally depicting physical caves and tunnels, its meaning expanded metaphorically to represent profound understanding ('penetrating insight') and emptiness. In Chinese philosophy, it came to describe the primordial void from which all things emerge, reflecting Daoist concepts of potentiality within emptiness. Arrived in Japan: The character 洞 arrived in Japan during the 5th-6th centuries CE, primarily through the introduction of Chinese Buddhist texts and Confucian classics. It was systematically adopted during the Asuka and Nara periods as part of the broader cultural exchange that brought Chinese writing and Buddhism to Japan, becoming established in the Japanese writing system by the 8th century.