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The character 蒼 (cāng) originally depicted lush, dense vegetation with its 'grass' radical (艹) atop, combined with 倉 (cāng) which provides phonetic value and contributes meaning of 'storage' or 'abundance.' In ancient China, it evolved to represent the vibrant blue-green color of thriving plant life, conveying meanings of lushness, vitality, and the expansive blue of the sky. Over time, it came to describe things with a bluish-green hue, youthfulness, and the vastness of nature, appearing in poetic compounds like 蒼天 (cāngtiān, 'blue sky') and 蒼茫 (cāngmáng, 'vast and hazy'). Arrived in Japan: The character 蒼 likely arrived in Japan during the 5th to 6th centuries CE, alongside the broader introduction of Chinese writing and literature. It was formally adopted into the Japanese writing system and is used in Sino-Japanese vocabulary (on'yomi reading 'sō') as well as native Japanese words (kun'yomi reading 'ao(i)'), appearing in terms such as 蒼白 (sōhaku, 'pale') and 蒼々 (sōsō, 'lush and blue').