I describe myself as working class because I need to work for a living and I don't own any other means of generating income besides selling my labour at its market value. Middle class used to mean owming other means of generating income, but the meaning of that distinction seems to have vanished - which is not a bad thing, although the symbolism has been appropriated by people who choose to make distinctions between themselves and other working class people who happen to earn less. A slightly more meaningful distinction is to do with professional work, which is now seen to be as work that is based on engagement with a body of scholarly literature, but that's changing too, as people recognise the expertise of skilled work that is not related to the validation of academic institutions. Upper class used to simply be people who didn't work, who probably seemed to be "better" than others because their hereditary wealth gave them access to better education, but that's all changing now too. I think it's all fairly interesting to think about in many ways, but at the same time I don't spend much time at all thinking about it, because I think it's all basically a load of dirty laundry.