So for today’s reading, Marxism and the Social History of Art, Barnard quotes Marx saying,

“it is not the consciousness of men that determines their existence, but their social existence that determines their consciousness”

Then Barnard goes on to say:

“social existence, or social being, refers to people’s identity as members of social classes. Marx is trying to explain the way in which economic, or class identity determines consciousness: he argues that what people think, believe and understand is a product of their place in a social and economic structure, their class identity” (Barnard, 120).

I’m trying to wrap my head around an illustration to better understand why Marx thinks this. Can anyone help me with an example of when this is true and an example of when this is false?