The Westphalian model of international relations has given us a zero-sum game of winners and losers that has proven to be ineffective in addressing the pressing issues of our times. Philosopher Zhao Tingyang has argued that by conceptualizing international relations from the planetary perspective of tianxia, we can develop a sense of “worldness” that at once acknowledges the plurality of moral ideals defining of the world’s cultures and seeks practical ways to formulate a shared m...