Neither Habermas nor his communitarian and poststructuralist critics sufficiently explore the non-linguistic, playful, and performative dimensions of contemporary public spheres. I argue that the approaches of Castoriadis and Touraine can inform a theoretical understanding of the history and current resonance of this public sphere of performance. Their concepts of the social imaginary, the autonomous society, and subjectivation highlight the role of fantasy, images, individualism, and other non-rational factors in late modern public life.