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Zhang Zai was a seminal neo-Confucian cosmologist and ethical thinker. Like Zhou Dunyi and Shao Yong, he was inspired by the Yijing (Book of Changes) and its commentaries; unlike them, he worked out a conception based solely on the concept of qi (cosmic vapour). He espoused an ethical vision, global in spirit, that greatly enhanced the moral significance of Confucianism.