Have to agree with Acyl on this one.
It's possible that the Byakugan, for instance, might have begun by developing a membrane on the edge of the eyeball (thus resulting in the white-eyed look) that filters out the user's own chakra from sight when needed, allowing them to sense chakra outside without being blinded by their own head being in the way. Then add in an intensely chakra-sensitive set of cells at the core of the retina, just over the optic nerve...--
"I give you the beautiful... the talented... the tirelessly atomic-powered...
R!
DOROTHY!
WAYNERIGHT!
--
Sucrose Octanitrate.
Proof positive that with sufficient motivation, you can make anything explode.
It's possible that the Byakugan, for instance, might have begun by developing a membrane on the edge of the eyeball (thus resulting in the white-eyed look) that filters out the user's own chakra from sight when needed, allowing them to sense chakra outside without being blinded by their own head being in the way. Then add in an intensely chakra-sensitive set of cells at the core of the retina, just over the optic nerve...--
"I give you the beautiful... the talented... the tirelessly atomic-powered...
R!
DOROTHY!
WAYNERIGHT!
--
Sucrose Octanitrate.
Proof positive that with sufficient motivation, you can make anything explode.