I have what I believe is a very interesting question, and one that I hope may
shed light on the potential of the mind and its effects on the body.

I am aware that there are some monks in the world that can, through deep
meditation, control some of the otherwise autonomic functions of the body.
Different body parts can be heated at will, and the heart controlled manually.
I began to wonder how far this control could be stretched, so to speak. Would
it be at all possible to willfully change, over great periods of time, physical
characteristics? Would one be able to grow hair in a different shade, or change
the pigment in their irises? Or is that beyond the brain? What other functions of
the brain are there that may be possibly exploited?