 Given this enthusiastic reception, it can come as something of a surprise to turn to Marx’s writings and discover how little they contain about ideology, and how inchoate and opaque those infrequent and passing observations on that topic are. There are, of course, some famous quotations, not least from The German Ideology manuscripts. The references there to ideology as involving an “inversion” of the relation between individuals and their circumstances, perhaps analogous to the workings of a “camera obscura”—an optical device which projected an image of its surroundings, upside down but preserving perspective, onto a screen inside—have often mesmerised commentators but not always generated much genuine illumination (MECW 5: 36). The point should not be exaggerated, but these striking images notwithstanding, there is no clear and sustained discussion of ideology in the Marxian corpus.