The regulation of the interfaces of private and public interests is a central and recurrent issue of modern law. The centrality of the distinction and the manifold conceptual and practical problems associated with it has moreover been exacerbated over the past fifty years through the dominance of the twin-episteme of law constituted by law and economics and human rights law. Against this background, an alternative approach to and concept of law, transformative law, is briefly introduced. An approach which implies replacing (...) the notions of private and public interests with the concepts of legally constituted public power and societal power. In order to analyse the potential and limits of transformative law, five legal phenomena, central to the other contributions to this special issue, are analysed: public interest litigation; legal mobilisation in the preliminary ruling procedure; bankruptcy proceedings; third-party litigation and the Meta Oversight Board. (shrink)