> On Sat, Jul 17, 2010 at 08:57:42PM -0400, [email protected] wrote: > > > > Shephard points out (in his paper speculating on why > > humans have a 3D color space) that for terrestrial > > animals (at least, ones that live above the scale > > where things like surface tension of water and > > viscosity of the atmosphere are big deals in daily > > life), the vertical axis defined by gravity is > > highly salient. What, we may ask, would a porpoise > > or a porgy make of your photo? > > > > Lee Rudolph > > > > This seems to be a non-sequitur. Most mammals have a 2D colour > space. Many birds (and a few rare humans, so called "tetrachromats") > have a 4D colour space. What possible connection could it have with > the spatial dimension?
I was referencing where I read it. I don't recall that it was part of his color-space argument; it was (probably) an interesting digression. (Thank goodness discussions on mailing lists never include digressions!) If I can find my copy (originally Nick's spare copy...) of the book it's in, I'll check later and try to get back with whatever I find. ============================================================ FRIAM Applied Complexity Group listserv Meets Fridays 9a-11:30 at cafe at St. John's College lectures, archives, unsubscribe, maps at http://www.friam.org
