 Possibilism in the geographical thought of Vidal de la Blache 
Vidal de la Blache pondered extensively the question of what could be done about the reality that he was studying. It is in light of this concern for action that the complementarity of his geographical and planning thoughts is explored. We explore several issues in this article. We first summarise the context of the formation of his ideas around the question of possibilism in order to turn, subsequently, to an assessment of what Vidal’s ideas might have shared with the philosophical developments of the turn of the century, especially with bergsonism. The question of temporality, genre (de vie), and method are then examined in order to characterize the place devoted in Vidal’s thought to contingency, indetermination, uncertainty, and creativity. Furthermore, we discuss convergent aspects of Vidal’s and Bergson’s thoughts about evolution.