Based on the hypothesis of Gilles Deleuze and Felix Guattari described in A Thousand Plateaus, this article presents the concepts of two models, two visions of the world, of culture and of literature: namely a traditional root-tree model and a modern rhizomatic model. I argue that the traditional fantastic follows the root-tree model while the new fantastic is closer to the rhizomatic model. In my article, I analyze the root-tree fantastic, whose principles are based on the rules characterizing the arborescent model: organization, reflection, imitation and analogy. The new fantastic, on the other hand, fulfills the criteria which, according to Deleuze and Guattari, describe the rhizome: connection, heterogeneity, multiplicity, asignifying rupture and cartography / decalcomania. The corpus of the analyzed texts consists of "La Venus d'Ille" as the example of the root-tree fantastic and the short stories from Hopital Nord series by Andrevon and Cousin as the model of the rhizomatic fantastic.