The Idea of Pure Critique will be invaluable to students of Kant as well as those interested in Deleuze and Guattari's contribution to philosophies of difference. More fundamentally, the book presents a series of stimulating political and philosophical challenges to the apathy and indifference that pervade modern life. What is required of critique if it is to overcome indifference? This question addresses core themes in modern, post-Kantian and European philosophy, challenging theory's resignation in the face of contemporary political and economic formations. In this book, Iain Mackenzie argues eloquently that if such indifference is to be overcome, critique must first be demarcated in its purity, as an idea of critique in and of itself. Moreover, for the idea of critique to become pure we must view it as being essentially the construction of difference. Only in this pure form, understood as the construction of difference, can critique hope to overcome the crushing indifference of our current age.