Contemporary philosophical research interconnects classical domains of philosophy, the arts, literature and social sciences. This collection of essays explores the operational role of experimentation, dissidence and heterogeneity in this process. It offers fundaments for the criticism of monolithical tendencies often put forward under the banner of the 'Speculative Turn' or New Realism, by means of exploring the contribution and influence of authors such as J. G. Hamann, Kierkegaard, Nietzsche and Guy Debord. These philosophers, historically placed within the margins of the philosophical mainstream, were decisive in the emergence of the philosophical thought and practices of Deleuze, Wittgenstein and Bataille, as shown here. The reader will also find re-evaluations of the contributions of Vico, Spinoza or Kant to posterity, next to new readings of authors like Foucault, Hadot, Benjamin and Adorno with regards to their significant experimental and dissident positions.