Immanuel Kant argued that in order to achieve a full understanding of the world it was necessary, in different contexts, to hold on to both ends of seemingly contradictory metaphysical propositions. The most famous such antinomy was the necessity of accepting both that everything in the world is causally explicable and that humans, as moral agents, must be assumed to possess free will. Transposing this insight to anthropology and sociology, it is argued that the best—most convincing—ethnographic monographs are those that embrace similar antinomies, as, for example, when anthropologists influenced by practice theory give equal emphasis to both structure and agency.