A lesson on diversity...

I would perhaps start by having 2 people of different races stand in front of the board. I would then ask the class to name the differences between them and write these on the board. I would then point out that the differences they indicated are all physical traits, on the surface, and this is not what makes a person. I would then do the exercise with the eggs and point out that just like the eggs, we're all the same on the inside.