According to Kelsen, law is a sensecontent and law has authority. The combination ofthese two claims appears puzzling. How is it possiblefor a sense content to have authority? Kelsen's notionof `basic norm' seems to provide an answer to thisquestion. Such an answer, however, simply leads to anew formulation of the question itself. How is a basicnorm possible? Kelsen's multiple and tentative answersto this question turn out to be untenable. A differentstarting point might be provided by Kelsen's notion of`social power'. On (...) closer scrutiny, however, anempowerment account of Kelsen's concept of theauthority of law proves unsatisfactory. Thus, ourreview of some candidate models for a Kelsenianexplication of the authority of law shows that none ofthem is a viable hypothesis. Kelsen's concept of theauthority of law is, at bottom, unintelligible. (shrink)