Zhang Zai’s 張載 “Western Inscription ” and Kant’s “Conclusion” of the Critique of Practical Reason are two profound pieces. As of yet, no comparative study has been made of the two. I argue that a comparative and contrasting study provides us a window into the central and powerful ideas within these two pieces. Section 2 of this article contrasts Zhang Zai’s “Heaven-Earth” with Kant’s starry heavens, his external “wonderland.” Section 3 contrasts Zhang Zai’s teaching of morality by personal commitment and (...) exemplars with Kant’s teaching of morality by a theory based on the moral law within, his inner “wonderland.” Section 4 compares and contrasts Zhang Zai’s human self-realization in the one world of Heaven-Earth with Kant’s human realization in the coming-together of the two “wonderlands.” By stressing some significant differences between Zhang Zai and Kant, I conclude that the view that takes Kant’s coming-together of the two “wonderlands” as a version of the union or interpenetration between the cosmos and the human will need important qualifications. (shrink)