Andy Canivet writes: > On Wed, 12 Jun 2002 18:41:40 +0100, And Rosta <[log in to unmask]> wrote: > > >Herman says: > >> "Violet" is a bit of a gray area. > > > >For me, it's a bit of a purple area. > > > >--And. > > LMFO... I remember in my perception class the instructor said something > about colours at that end of the spectrum (the purple end) not actually > existing at all - perceptually, purple is a mix of red and blue light, but > red and blue are at opposite ends of a linear spectrum... I think he said > in the same lecture that instead of three types of cones, many species of > fish have four, five, or six types of colour cones in their > retinas... I believe there are supposed to be people with a fourth cone type... I seem to recall the word used was "tetrachromat". Very rare, though. Supposed to have exceptionally precise colour sense - I'd suspect Cristophe was one with his "Indigo isn't a type of blue", but IIRC they're all supposed to be female. I'm not sure if any have actually been found, come to think of it.