Infinite shades of red... I was assuming the red spectrum could be broken down into infinite wavelenghts (If you say no, I won't argue. I'm no expert on light!), Also, I never assumed a human could see them all. PLUS people can see black.... just ask Ray Charles & Stevie Wonder! 
That is an interseting tid-bit about humans only seeing 256 shades. I need an upgrade, I discovered I am partly shade blind in pilot school (actually I'm shade blind everywhere not just in pilot school 
). Didn't keep me from flying (just from finding the runways ). I also learned most men are shade blind a slight degree.
This is sure getting deep from 3 guys getting change for a $5! LOL
