Nothing about reality? I live in a crappy little town in the middle of nowhere and many of the people I know are like the ones in the story. Chained together, facing a blank wall assuming they know everything because of the shadows on the wall. To explain this, they have no clue about the world outside of their little town. Oh they can say I know its there, but do they know anything about it? No. Their happy being in the dark ( No education) and if you try to explain what the world is like outside of their dark little cave they argue with you until their blue. The world is full of people like that. People happy to be in the dark about the things going on around them. A friend of my moms told her the news is a lie and there was no such thing as rape or even murder. That's in the dark my friend and I stand by Plato's allegory of the Cave completely. The man was a F'ing genius.