I think it's OK to use the word 'nigger' in the right context, like as depicted in art. I don't think it would be Ok to call a black person a nigger out of any other context than that. I obviously think it's OK to explain this without having to resort to saying 'the 'N word', since saying that just makes you say it in your own head. We all know what is meant, I think the person saying it has a responsibility to actually say the word instead of making me say it in my own mind. I think saying it in this context deflates the power those who would otherwise say it in a derogatory fashion have.