“Dialectical materialism is, first, a materialism without matter, without the metaphysical notion of matter as a full substantial entity— in dialectical materialism, matter “disappears” in a set of purely formal relations . Second, despite being materialism without matter, it is not idealism without an idea— it is a materialism with an Idea, an assertion of the eternal Idea outside the space of idealism . In contrast to idealism, whose problem is how to explain temporal finite reality if our starting point is the eternal order of Ideas, materialism’s problem is how to explain the rise of an eternal Idea out of the activity of people caught in a finite historical situation”

Absolute Recoil: Towards A New Foundation Of Dialectical Materialism by Zizek, Slavoj