Exactly! People have the potential for mutations, too. Every animal does. Usually it shows up as a disease or some unusual feature, but in some really rare cases, you get someone like me. [Grinning more easily now, he spread his hands and swept them down his body in a theatrical gesture.]

Except with us, it can be more varied. I know a lot of people like me, and only two of them are blue. Most of them look completely normal.