the reason is to make it differences so you can tell who is who. As it stands now their has been so much lost because of the world waiting to be the same. We have lost the differ way people, dressed, eat ,dance, and live. when we finely cone to be one type of people in the world we will not have any thing know any thing and have no different. It is like shopping at Wal Mart. You have no choises just one brand to by. you do know that differnt types of food have differnt tast. If Wal mart had there way it would just one type of food you would get.