> It makes you wonder what the world would look like if our eyes
> had a flat response. I read somewhere that for red light to look
> the same amplitude, it had to be same large number, like 1000,
> times brighter. This makes me imagine how painful a sunset
> would be. :)
>
> Brandon Irwin

In a similar vein, body parts have individual sensation regions
in the brain. The "Sensory homunculus" is a map of these
regions, and is usually accompanied by a diagram or model
of how big body parts would be if they all had the same nerve
density representation in the brain. We usually come out looking
like a frog or Mr Potatohead. I've got a 3D model somewhere

http://www.cs.uta.fi/~jh/homunculus.html

http://www.mhhe.com/biosci/esp/2001_saladin/folder_structure/in/m2/s9/inm2s9
_1.htm

http://www.fmrib.ox.ac.uk/~stuart/thesis/chapter_3/section3_2.html

Fig 3-13

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