My initial thoughts were that it would be so hard as a teacher to tell children explicitly that some of them were better than others. She was very bold in doing that, and she trusted the kids to be able to handle it. It really was amazing how quickly the kids assumed their redefined identities, and how being told that you are better than another person leads to poor treatment of those "beneath" you in that system. I think this is also illustrated in the Stanford Prison Experiment. As humans, we so quickly just accept whatever we are socialized into, and if we want to act morally or justly, we have to be on guard in order to identify what we are being taught in the systems we are a part of. This experiment so profoundly illustrates the vigilance that is needed.