Michel Foucault wrote the preface to Anti-Oedipus by Gilles Deleuze and Félix Guattari. In the preface, Foucault discusses how ideas of Marx and Freud had become hindrances in mid-20th century France. He also discusses how Anti-Oedipus seeks to analyze the relationship between desire and reality in capitalist society. Finally, Foucault summarizes some of the principles of an "anti-Oedipal" way of living that is presented in Anti-Oedipus, such as freeing political action from totalizing ideas and proliferating thought through difference rather than systems.