A central challenge of Amartya Sen’s comparative view of justice is to bring cultural diversity to bear on conceptualizing global justice, which includes building bridges across cultures that enable effective action, and rendering compatible the most beneficent of Rawlsian (or transcendental) intentions with irreducible cultural diversity. For social scientists meeting this challenge requires, first, taking account of variation of social practices in the social construction of meaning, and second, uncovering invisible frontiers of global justice that remain hidden due to conceptual (...) or empirical oversight. The latter is especially true for contemporary International Relations (IR) theory, which assumes state actors to be the main interlocutors in the global realm, and thus precludes consideration of micro-level forms of inter-national relations (understood as interaction among all types of actors that takes place across country borders and that bears traits of national identity). Alternatively, Sen’s micro-perspectival approach offers a welcome support for pluralist approaches that both appreciate non-state access to contestation in the international arena, and account for the meaning-in-use of fundamental norms (democracy, rule of law, human rights) in different cultural and inter-national contexts. (shrink)