What walls do you want to knock down?
I'd like to knock down racial walls. Twice last week at work, I heard people make reference to the race of people they were talking about. Although there are times that mention of race might be pertinent, e.g., race can put a person in a higher risk category for certain diseases, in both of these cases it was not only unnecessary but inappropriate to mention race. Both times, race was used to "explain" the problems each person had experienced with the other person. For what it's worth, insofar as I could tell, the problems they were having had nothing to do with race. It will be a better world when all of us can get beyond this.