Different theories on public sphere(s) complete each other or collide in examining the intersubjective relationships involved in organizing and administering the responses of society to the political and economical power repertory. Habermas's default theory, who invokes the critical participation of every citizen in the public communication, is rather extended in the counter-theories represented by Fraser's "subaltern counterpublics", Mouffe's "agonistic politics" or Hardt and Negri's "shared

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... mmons". These observations are undertaken by artists in their public art practices and inform the contemporary art theories on audience participation. Hardt and Negri's "shared commons" and applied in public art practices. The various philosophical concepts and theories are engaged in an exchange of services aiming to improve the understanding and the pragmatics of the codes used in negotiating positions in a publically ordered environment. Acceptations and uses inform and orient an economic process of accumulation and reinvestment of the cognitive capital flow. The know-how ensures the success of intersubjective communication, but it cannot guarantee the public benefit.