> erm, actually the RW example I was thinking of is that the human retina is
> sensitive into the ultraviolet spectrum, but the lens is opaque to it --
> but people who have had their natural lenses replaced surgically by
> artificial ones can see into the ultraviolet, effectively having an eighth
> colour in their spectrum.
That would be Octarine.
RR
>From such a face and form as mine, the noblest sentiments sound like the
black utterances of a depraved imagination.