Can the public sphere be conceptualised in a manner that is non-reductive and inclusive? In this article, we survey the main literature on the public sphere and demonstrate that, despite apparent diversity, the dominant approaches to its conceptualisation share the same ‘matter and form’ or hylomorphic assumptions. In challenging these assumptions, our aim is to demonstrate that it is the hylomorphic model of the public sphere that prevents non-reductive conceptualisation of its essentially changing nature. Hylomorphic models of the public sphere, (...) we argue, will never yield this result because they perpetuate established identities over emergent differences. We conclude that progress toward non-reductive and inclusive accounts of the public sphere would be best served by foregoing hylomorphic models in favour of ontogenetic ones, when thinking about the changing nature of the public sphere. (shrink)