What is needed for something new to appear According to Gilles Deleuze one of the most brilliant of contemporary philosophers this question of novelty is the major problem posed by Bergsons work. In Bergsonism Deleuze demonstrates both the development and the range of three fundamental Bergsonian concepts duration memory and the lan vital. A perfect companion book to Bergsons Matter and Memory Bergsonism is also of particular interest to students of Deleuzes own work influenced as it is by Bergs