Following some of the main arguments Derrida develops in ‘White Mythology’, in this article I propose an unexplored dialogue between Derrida and Althusser considering the use and the place that each of them gives to metaphor in their philosophical strategies. I give special attention to some rather isolated passages of ‘Elements of Self-Criticism’ and ‘Lenin and Philosophy’, where Althusser, against all evidence, seems to be quite aware of the importance of metaphor and mataphorization in every philosophical practice. As Balibar has (...) argued, contrary to the metaphysical tradition, metaphor would not be the opposite but what anticipates the concept. In this sense, it is possible to observe how Althusser’s work has continuously put into practice – as the singular signature of his theoretical practice – something that I call the ‘detour of metaphor’ as a necessary ‘deviation’ for the production of new concepts. Without any evidence that Althusser may have known Derrida’s essay, I show how Althusser’s own theoretical work, one in which ‘metaphor’ as a philosophical theme appears to be rather anecdotic, is unexpectedly close to Derrida’s own positions concerning the margins of philosophy and its ‘outside’, the relation to the metaphysical tradition, and the importance of strategy in philosophy. (shrink)